High-voltage direct-current power supply system and control method for LED fishing light of fishing boat

Abstract

This invention discloses a high-voltage DC power supply system and control method for LED fish-attracting lights on fishing boats. The system employs a PLL (phase-locked loop) to achieve precise phase tracking of the power grid within a wide frequency range of 40Hz to 55Hz. Through dual closed-loop control of the voltage outer loop and current inner loop combined with SVPWM modulation, it stably outputs a 700V to 800V high-voltage DC bus under a wide voltage fluctuation range of 380V to 450V from the ship's generator. The q-axis current command is set to zero to achieve unity power factor operation, effectively reducing harmonics and avoiding interference with the ship's radar, navigation, and communication equipment. The subsequent DC / DC unit uses isolated or non-isolated step-down circuits to convert the high-voltage bus voltage to the operating voltage required by the LED fish-attracting lights. This invention features high voltage utilization, high system efficiency, and adaptability to the harsh electrical environment of fishing boats, significantly reducing line losses and fuel consumption.

Description

Technical Field

[0001] This invention relates to the field of marine power management technology, specifically to a high-voltage DC power supply system and control method for LED fish-attracting lights on fishing boats. Background Technology

[0002] Coastal and deep-sea fishing vessels typically use diesel generator sets as their main power source. The generator's output voltage and frequency are affected by factors such as load variations, sea conditions, and engine speed fluctuations, resulting in a significant range of fluctuations during actual operation. Typical values ​​are: frequency 40Hz–55Hz, line voltage 380V–450V. LED fish-attracting lights, due to their high luminous efficiency and long lifespan, are gradually replacing traditional metal halide lamps. However, currently, the power supply for fishing vessel LED fish-attracting lights mostly uses diode uncontrolled rectification schemes. This scheme has the following inherent defects: First, uncontrolled rectification cannot achieve controllable bus voltage, cannot output stable high-voltage DC, resulting in large line losses and being unable to adapt to the harsh operating conditions of generators with wide frequency and voltage ranges; second, uncontrolled rectification has a low power factor and large harmonic currents, easily causing serious electromagnetic interference to ship radar, navigation, and communication equipment. These factors mean that existing ship power supply systems cannot simultaneously achieve stable high-voltage DC output, unity power factor, low harmonic suppression, and electromagnetic compatibility with radar navigation equipment under the extreme and harsh conditions of wide frequency (40-55Hz), wide voltage (380-450V), and high frequency variation and voltage distortion rates of fishing boat generators. Summary of the Invention

[0003] To address the poor overall efficiency of existing DC power supply systems, this application provides a high-voltage DC power supply system and control method for LED fish-attracting lights on fishing boats. The specific technical solution of this application is as follows:

[0004] A high-voltage DC power supply system for LED fish-attracting lights on fishing boats, applied between the ship's electrical grid and the LED fish-attracting lights, includes: a three-phase input unit for receiving AC power output from the ship's electrical grid; a grid-side filter inductor for filtering the AC power received by the three-phase input unit; a three-phase PWM rectifier unit for converting the filtered AC power into DC power; a sampling unit for acquiring the voltage of the ship's electrical grid, the current of the three-phase PWM rectifier unit, and the voltage of the high-voltage DC bus; a PLL phase-locked loop unit for tracking the phase and frequency of the voltage of the ship's electrical grid; a coordinate transformation unit for performing Clark and Park transformations on the acquired current of the three-phase PWM rectifier unit to obtain the d-axis current and q-axis current; a voltage outer loop unit for generating a d-axis current command based on the difference between the target voltage and the actual voltage of the high-voltage DC bus, and setting the q-axis current command according to actual needs; and a current inner loop unit for outputting a target d-axis voltage command based on the difference between the generated d-axis current command and the obtained d-axis current. The system outputs the target q-axis voltage command based on the difference between the set q-axis current command and the obtained q-axis current; the SVPWM modulation unit receives the output values ​​of the inverse Clark and inverse Park transformations of the target d-axis voltage command and the target q-axis voltage command from the coordinate transformation unit, and generates a PWM signal based on the output values; the drive unit drives the three-phase PWM rectifier unit according to the PWM signal, so that the three-phase PWM rectifier unit converts the received output voltage into a voltage within a set range; the DC bus capacitor unit receives DC current within a set range to form a high-voltage DC bus within a set range; the downstream DC / DC unit converts the voltage of the high-voltage DC bus within a set range into the working voltage of the LED fish-attracting lamp; and the control unit controls the operation of the PLL phase-locked loop unit, coordinate transformation unit, voltage outer loop unit, current inner loop unit, and SVPWM modulation unit, and adjusts the phase and frequency of the voltage of the three-phase PWM rectifier unit according to the phase and frequency of the voltage of the tracked ship's electrical network.

[0005] Furthermore, the subsequent DC / DC unit is an isolated buck converter; wherein, the isolated buck converter includes an LLC resonant converter as well as a flyback isolation circuit, a forward isolation circuit, a half-bridge isolation circuit, and a full-bridge isolation circuit;

[0006] Furthermore, the subsequent DC / DC unit is a non-isolated buck converter; wherein, the non-isolated buck converter includes a Buck buck converter and a Buck non-isolated topology circuit.

[0007] Furthermore, the three-phase PWM rectifier unit has a three-phase fully controlled bridge structure composed of six 1200V-level power switching transistors, which is used to realize AC-DC rectification and active boost.

[0008] Furthermore, the three-phase PWM rectifier unit is used to convert the filtered 380V~450V AC power into 700V~800V DC power.

[0009] Furthermore, the PLL phase-locked loop unit is used to achieve adaptive phase-locking within a wide frequency range of 40Hz to 55Hz.

[0010] Furthermore, the voltage outer loop unit sets the q-axis current command to zero to achieve unity power factor.

[0011] Furthermore, the DC bus capacitor unit is composed of at least two 450V electrolytic capacitors connected in series.

[0012] Furthermore, the control unit integrates protection logic; wherein the protection logic includes: bus overvoltage protection, bus undervoltage protection, overcurrent protection, overtemperature protection, and generator backfeed protection.

[0013] A control method for a high-voltage DC power supply system of an LED fish-attracting light for a fishing boat includes the following steps: A control unit receives data from a sampling unit, including the voltage of the ship's electrical grid, the current of a three-phase PWM rectifier unit, and the voltage of the high-voltage DC bus; the control unit tracks the phase and frequency of the voltage of the ship's electrical grid via a PLL phase-locked loop unit to adjust the phase and frequency of the voltage of the three-phase PWM rectifier unit; a coordinate transformation unit performs Clark and Park transformations on the collected current of the three-phase PWM rectifier unit to obtain the d-axis current and q-axis current; an outer voltage loop unit generates a d-axis current command based on the difference between the target voltage and the actual voltage of the high-voltage DC bus, and sets the q-axis current command according to actual needs; an inner current loop unit adjusts the q-axis current command based on the generated d-axis current command and the... The difference between the obtained d-axis currents is used to output the target d-axis voltage command, and the difference between the set q-axis current command and the obtained q-axis current is used to output the target q-axis voltage command. The coordinate transformation unit performs inverse Clark transformation and inverse Park transformation on the target d-axis voltage command and the target q-axis voltage command to obtain the output value. The SVPWM modulation unit generates a PWM signal based on the output value. The drive unit drives the three-phase PWM rectifier unit according to the PWM signal, so that the three-phase PWM rectifier unit converts the received output voltage into a voltage within the set range. The DC bus capacitor unit receives DC current with a voltage within the set range to form a high-voltage DC bus with a voltage within the set range. The subsequent DC / DC unit converts the voltage of the high-voltage DC bus within the set range into the working voltage of the LED fish-attracting lamp.

[0014] This invention provides a high-voltage DC power supply system for LED fish-attracting lights on fishing boats. By adopting a two-stage architecture of three-phase PWM rectification and subsequent DC / DC conversion, combined with advanced control strategies, the following significant technical effects are achieved:

[0015] Wide-range adaptive capability and stable high-voltage DC output: The control unit achieves precise phase tracking of the power grid across a wide frequency range of 40Hz to 55Hz through a PLL phase-locked loop unit. It employs dual closed-loop control (voltage outer loop and current inner loop) combined with SVPWM modulation technology. This allows it to actively adjust the switching state of the three-phase PWM rectifier unit under wide voltage fluctuation conditions (380V to 450V) of the ship's generator, ensuring a stable output of 700V to 800V high-voltage DC to the bus. It is precisely this 'adaptive bandwidth PLL' and 'frequency change rate feedforward compensation' that suppresses bus voltage fluctuations within the set range even under severe sea conditions with high frequency abrupt changes.

[0016] Operating at unity power factor with low harmonics and no interference to ship equipment: The voltage outer loop unit sets the q-axis current command to zero, and with the precise phase tracking of the PLL phase-locked loop, the three-phase PWM rectifier unit achieves unity power factor input. The grid-side current is sinusoidal, resulting in extremely low harmonic content, effectively avoiding electromagnetic interference to ship radar, navigation, and communication equipment caused by traditional uncontrolled rectifier schemes, thus ensuring navigation and operational safety.

[0017] High system efficiency and significantly reduced fuel consumption: The system adopts active PWM rectification and high-efficiency DC / DC conversion (isolated or non-isolated step-down circuit), which greatly improves the overall efficiency. Compared with traditional solutions, it can reduce generator fuel consumption, extend equipment life and reduce fishing vessel operating costs.

[0018] The robust protection logic adapts to the harsh electrical environment of fishing vessels: The control unit integrates multiple protection functions such as bus overvoltage, undervoltage, overcurrent, overtemperature and generator backflow, ensuring that the system can still work reliably under abnormal conditions such as drastic fluctuations in generator output voltage and sudden load changes, thereby improving the robustness and safety of the system. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a high-voltage DC power supply system in one embodiment of this application. Detailed Implementation

[0020] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.

[0021] In the description of this application, it should be noted that the directional terms such as "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this application.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Thus, the use of "first" or "second" to define a feature may explicitly or implicitly include one or more of that feature, and in the description of this application, "at least" means one or more, unless otherwise explicitly specified.

[0023] In this application, unless otherwise expressly specified and limited, the terms "assembly," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can also refer to a mechanical connection; they can refer to a direct connection or a connection through an intermediate medium; or they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0024] In the application, unless otherwise specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "below," and "over" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Above," "below," and "below" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0025] The following description, in conjunction with the accompanying drawings, further illustrates specific embodiments of this application, making the technical solution and its beneficial effects clearer and more explicit. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, but should not be construed as limiting it.

[0026] like Figure 1As shown, a high-voltage DC power supply system for an LED fish-attracting light on a fishing boat is applied between the boat's electrical grid and the LED fish-attracting light. It includes: a three-phase input unit for receiving AC power output from the boat's electrical grid, typically 380V–450V with fluctuating frequency; a grid-side filter inductor for filtering the AC power received by the three-phase input unit to suppress high-frequency harmonics and electromagnetic interference, improving the quality of the input power; a three-phase PWM rectifier unit for efficiently converting the filtered AC power into DC power and implementing power factor correction and active voltage boosting; a sampling unit for real-time acquisition of the voltage of the boat's electrical grid, the current of the three-phase PWM rectifier unit, and the voltage of the high-voltage DC bus, providing accurate feedback signals for closed-loop control; and a PLL (phase-locked loop) unit for accurately tracking the phase and frequency of the voltage in the boat's electrical grid, ensuring synchronous operation of the rectifier and the grid. The coordinate transformation unit is used to perform Clark transformation (converting the three-phase stationary coordinate system into a two-phase stationary coordinate system) and Park transformation (converting the two-phase stationary coordinate system into a two-phase rotating coordinate system) on the current of the three-phase PWM rectifier unit to obtain the d-axis current (active current component) and q-axis current (reactive current component). The coordinate transformation unit also integrates a specific harmonic extraction and suppression module, which is used to extract the 5th and 7th harmonic components from the collected ship grid voltage and generate corresponding compensation commands to be superimposed on the output of the current inner loop unit to actively suppress the 5th and 7th harmonics in the grid-side current.The voltage outer loop unit generates a d-axis current command (active current command) based on the difference between the target voltage (given value) and the actual voltage (feedback value) of the HVDC bus via a PI regulator, and sets a q-axis current command (reactive current command, usually set to zero to achieve unity power factor) according to actual needs. The current inner loop unit outputs a target d-axis voltage command based on the difference between the generated d-axis current command and the obtained d-axis current, and outputs a target q-axis voltage command based on the difference between the set q-axis current command and the obtained q-axis current, thus achieving fast and accurate current tracking control. The SVPWM modulation unit (space vector pulse width modulation unit) receives the voltage vector value output by the coordinate transformation unit after performing inverse Park and inverse Clark transformations (converting the voltage command in the rotating coordinate system back to the three-phase stationary coordinate system) on the target d-axis and target q-axis voltage commands, and generates corresponding 6-channel PWM switching signals based on this output value. The drive unit is used to generate 6-channel PWM switching signals based on the SVPWM modulation... The unit generates six PWM signals, which, after isolation and amplification, drive the power switching transistors in the three-phase PWM rectifier unit to turn on and off, enabling the three-phase PWM rectifier unit to convert the received input voltage into a stable DC voltage within a set range. The DC bus capacitor unit receives DC voltage within a set range and forms a stable, low-ripple high-voltage DC bus through energy storage and filtering, providing energy for the subsequent converter. The subsequent DC / DC unit converts the high-voltage DC bus voltage within a set range into the operating voltage required by the LED fish-attracting lamp (usually a lower safety voltage) to meet the direct power supply requirements of the fish-attracting lamp. The control unit (usually a DSP or MCU) coordinates the operation of the PLL phase-locked loop unit, coordinate transformation unit, voltage outer loop unit, current inner loop unit, and SVPWM modulation unit, and dynamically adjusts the phase and frequency of the three-phase PWM rectifier unit's voltage based on the phase and frequency of the tracked ship's power grid voltage, achieving grid synchronization and high-quality power conversion. Furthermore, the control unit is configured to adaptively adjust the bandwidth of the loop filter when the frequency change rate of the ship's power grid exceeds a preset threshold (e.g., 5 Hz / s) in order to maintain phase-locked stability and suppress phase jumps during rapid frequency fluctuations.

[0027] As one embodiment, the subsequent DC / DC unit is an isolated buck converter; wherein, the isolated buck converter includes an LLC resonant converter as well as flyback isolation circuit, forward isolation circuit, half-bridge isolation circuit and full-bridge isolation circuit; these isolated topologies can provide electrical isolation while realizing voltage transformation, thereby improving safety and anti-interference capability.

[0028] In one embodiment, the downstream DC / DC unit is a non-isolated buck converter; wherein, the non-isolated buck converter includes a Buck buck converter and a Buck non-isolated topology circuit; the non-isolated solution has a simpler structure and lower cost, and is suitable for applications where isolation requirements are not high. Multiple downstream DC / DC units are connected to multiple groups of LED fish-attracting lights; the control unit also includes a load mutation feedforward suppression module, used to pre-adjust the output power command of the three-phase PWM rectifier unit according to the target light group power before receiving the LED fish-attracting light group switching command, and to use step-by-step slope control to increase or decrease the high-voltage DC bus voltage to offset the bus voltage drop or overshoot caused by load mutation.

[0029] In one embodiment, the three-phase PWM rectifier unit has a three-phase fully controlled bridge structure composed of six 1200V-level power switches (such as IGBTs or MOSFETs) to achieve AC-DC rectification and active boost, ensuring a stable high-voltage DC output over a wide input voltage range. The six power switches of the three-phase PWM rectifier unit are divided into two redundant bridge arms. The control unit also includes a fault reconfiguration module, which automatically isolates the faulty bridge arm and reconfigures the modulation strategy of the SVPWM modulation unit when any power switch fault is detected, allowing the system to continue operating in derating mode.

[0030] In one embodiment, the three-phase PWM rectifier unit is used to convert the filtered 380V-450V AC power into 700V-800V DC power. The higher DC bus voltage helps to reduce the transmission current, thereby reducing line loss and meeting the power supply requirements of the long-distance high-power fish-attracting lights of fishing boats.

[0031] As one embodiment, the PLL phase-locked loop unit is used to achieve adaptive phase-locking in a wide frequency range of 40Hz to 55Hz, which can reliably track the frequency fluctuations generated by the ship's generator when the speed changes, ensure the stability of the rectifier control algorithm, and adapt to the working conditions of large frequency fluctuations of the generators on nearshore or deep-sea fishing vessels.

[0032] In one embodiment, the voltage outer loop unit sets the q-axis current command to zero to achieve unity power factor, thereby making the grid-side current and voltage in phase, eliminating reactive power, reducing grid-side harmonic content, reducing interference to other sensitive electrical equipment on board, and also reducing generator harmonics and fuel consumption.

[0033] In one embodiment, the DC bus capacitor unit is composed of at least two 450V electrolytic capacitors connected in series, with a total withstand voltage of not less than 900V, meeting the safe operation requirements of an 800V bus, and is equipped with an equalizing resistor to withstand a DC bus voltage of 700V to 800V, while improving the withstand voltage capability and reliability of the capacitor bank.

[0034] In one embodiment, the control unit integrates protection logic, which includes: bus overvoltage protection, bus undervoltage protection, overcurrent protection, overtemperature protection, and generator backfeed protection. These protection functions can quickly block the PWM output and issue alarms under abnormal operating conditions to prevent equipment damage and ensure safe system operation. When the high-voltage DC bus voltage is detected to be higher than the target value and the current direction of the three-phase PWM rectifier unit is reversed, the three-phase PWM rectifier unit is controlled to enter inverter mode to feed back the excess energy stored in the DC bus capacitor unit to the ship's power grid. By limiting the feedback power and rate of change, the impact on the ship's generator is avoided.

[0035] A control method for a high-voltage DC power supply system of an LED fish-attracting light for a fishing boat includes the following steps: A control unit receives the voltage of the ship's power grid, the current of the three-phase PWM rectifier unit, and the voltage of the high-voltage DC bus from a sampling unit; the control unit tracks the phase and frequency of the ship's power grid voltage through a PLL phase-locked loop unit to adjust the phase and frequency of the three-phase PWM rectifier unit voltage, achieving grid synchronization; a coordinate transformation unit performs Clark and Park transformations on the collected current of the three-phase PWM rectifier unit to obtain the d-axis current and q-axis current; a voltage outer loop unit generates a d-axis current command based on the difference between the target voltage and the actual voltage of the high-voltage DC bus through PI regulation, and sets the q-axis current command (usually zero) according to actual needs; a current inner loop unit outputs a target d-axis voltage command based on the difference between the generated d-axis current command and the obtained d-axis current, and outputs the target d-axis voltage command based on the set q-axis current. The difference between the command and the obtained q-axis current outputs the target q-axis voltage command; the coordinate transformation unit performs inverse Park and inverse Clark transformations on the target d-axis voltage command and the target q-axis voltage command to obtain the voltage vector output value in the two-phase stationary coordinate system; the SVPWM modulation unit calculates the duty cycle of each power switch based on the output value and generates the corresponding 6-channel PWM signal; the drive unit drives the power switches in the three-phase PWM rectifier unit to turn on and off based on the isolated and amplified PWM signal, so that the three-phase PWM rectifier unit converts the received input voltage into a stable DC voltage within the set range; the DC bus capacitor unit receives the DC voltage within the set range and forms a high-voltage DC bus with stable voltage and low ripple through the smoothing effect of the capacitor; the subsequent DC / DC unit further converts the voltage of the high-voltage DC bus within the set range into the working voltage required by the LED fish-attracting lamp, ultimately providing high-quality power to the fish-attracting lamp.

[0036] This invention provides a high-voltage DC power supply system for LED fish-attracting lights on fishing boats. By adopting a two-stage architecture of three-phase PWM rectification and subsequent DC / DC conversion, combined with advanced control strategies, the following significant technical effects are achieved:

[0037] Wide-range adaptive capability and stable high-voltage DC output: The control unit achieves precise phase tracking of the power grid across a wide frequency range of 40Hz to 55Hz through a PLL phase-locked loop unit. It employs dual closed-loop control (voltage outer loop and current inner loop) combined with SVPWM modulation technology. This allows it to actively adjust the switching state of the three-phase PWM rectifier unit under wide voltage fluctuation conditions (380V to 450V) of the ship's generator, ensuring a stable output of 700V to 800V high-voltage DC to the bus. It is precisely this 'adaptive bandwidth PLL' and 'frequency change rate feedforward compensation' that suppresses bus voltage fluctuations within the set range even under severe sea conditions with high frequency abrupt changes.

[0038] Operating at unity power factor with low harmonics and no interference to ship equipment: The voltage outer loop unit sets the q-axis current command to zero, and with the precise phase tracking of the PLL phase-locked loop, the three-phase PWM rectifier unit achieves unity power factor input. The grid-side current is sinusoidal, resulting in extremely low harmonic content, effectively avoiding electromagnetic interference to ship radar, navigation, and communication equipment caused by traditional uncontrolled rectifier schemes, thus ensuring navigation and operational safety.

[0039] High system efficiency and significantly reduced fuel consumption: The system adopts active PWM rectification and high-efficiency DC / DC conversion (isolated or non-isolated step-down circuit), which greatly improves the overall efficiency. Compared with traditional solutions, it can reduce generator fuel consumption, extend equipment life and reduce fishing vessel operating costs.

[0040] The robust protection logic adapts to the harsh electrical environment of fishing vessels: The control unit integrates multiple protection functions such as bus overvoltage, undervoltage, overcurrent, overtemperature and generator backflow, ensuring that the system can still work reliably under abnormal conditions such as drastic fluctuations in generator output voltage and sudden load changes, thereby improving the robustness and safety of the system.

[0041] In the description of this specification, the terms "an embodiment," "preferred," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. The illustrative expressions of the above terms in this specification do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples. The connection methods linked in the description of this specification have significant effects and practical utility.

[0042] Based on the above description of the structure and principles, those skilled in the art should understand that this application is not limited to the specific embodiments described above. Improvements and substitutions made using techniques known in the art based on this application all fall within the protection scope of this application and should be defined by the claims.

Claims

1. A high-voltage DC power supply system for LED fish-attracting lights on fishing boats, applied between the ship's electrical grid and the LED fish-attracting lights, characterized in that, include: The three-phase input unit is used to receive AC power output from the ship's electrical grid. The grid-side filter inductor is used to filter the AC power received by the three-phase input unit. The three-phase PWM rectifier unit is used to convert the filtered AC power into DC power. The sampling unit is used to collect the voltage of the ship's power grid, the current of the three-phase PWM rectifier unit, and the voltage of the high-voltage DC bus. A PLL (phase-locked loop) unit is used to track the phase and frequency of the voltage in the ship's electrical network; The coordinate transformation unit is used to perform Clark and Park transformations on the current of the three-phase PWM rectifier unit to obtain the d-axis current and q-axis current. The voltage outer loop unit is used to generate d-axis current commands based on the difference between the target voltage and the actual voltage of the high-voltage DC bus, and to set q-axis current commands according to actual needs. The inner current loop unit is used to output the target d-axis voltage command based on the difference between the generated d-axis current command and the obtained d-axis current, and to output the target q-axis voltage command based on the difference between the set q-axis current command and the obtained q-axis current. The SVPWM modulation unit is used to receive the output values ​​of the inverse Clark transformation and inverse Park transformation of the target d-axis voltage command and the target q-axis voltage command from the coordinate transformation unit, and generate a PWM signal based on the output values. The driving unit is used to drive the three-phase PWM rectifier unit according to the PWM signal, so that the three-phase PWM rectifier unit converts the received output voltage into a voltage within a set range; The DC bus capacitor unit is used to receive DC current with a voltage within a set range to form a high-voltage DC bus with a voltage within a set range. The downstream DC / DC unit is used to convert the voltage of the high-voltage DC bus within a set range into the working voltage of the LED fish-attracting lamp; The control unit is used to control the operation of the PLL phase-locked loop unit, coordinate transformation unit, voltage outer loop unit, current inner loop unit and SVPWM modulation unit, and to adjust the phase and frequency of the voltage of the three-phase PWM rectifier unit according to the phase and frequency of the voltage of the tracked ship's power grid.

2. The high-voltage DC power supply system for the LED fish-attracting light on fishing boats according to claim 1, characterized in that, The subsequent DC / DC unit is an isolated buck converter; Among them, the isolated buck converter includes LLC resonant converter as well as flyback isolation circuit, forward isolation circuit, half-bridge isolation circuit and full-bridge isolation circuit.

3. The high-voltage DC power supply system for the LED fish-attracting light on fishing boats according to claim 1, characterized in that, The subsequent DC / DC unit is a non-isolated buck converter; Among them, non-isolated buck converters include Buck buck converters and Buck non-isolated topologies.

4. The high-voltage DC power supply system for the LED fish-attracting light on fishing boats according to claim 1, characterized in that, The three-phase PWM rectifier unit has a three-phase fully controlled bridge structure composed of six 1200V-level power switching transistors, which is used to realize AC-DC rectification and active boost.

5. The high-voltage DC power supply system for the LED fish-attracting light on fishing boats according to claim 1, characterized in that, The three-phase PWM rectifier unit is used to convert the filtered 380V-450V AC power into 700V-800V DC power.

6. The high-voltage DC power supply system for the LED fish-attracting light on fishing boats according to claim 1, characterized in that, The PLL phase-locked loop unit is used to achieve adaptive phase-locking within a wide frequency range of 40Hz to 55Hz.

7. The high-voltage DC power supply system for the LED fish-attracting light on fishing boats according to claim 1, characterized in that, The voltage outer loop unit sets the q-axis current command to zero to achieve unity power factor.

8. The high-voltage DC power supply system for the LED fish-attracting light on fishing boats according to claim 1, characterized in that, The DC bus capacitor unit consists of at least two 450V electrolytic capacitors connected in series.

9. The high-voltage DC power supply system for the LED fish-attracting light on fishing boats according to claim 1, characterized in that, The control unit integrates protection logic; The protection logic includes: bus overvoltage protection, bus undervoltage protection, overcurrent protection, overtemperature protection, and generator backfeed protection.

10. A control method for a high-voltage DC power supply system of an LED fish-attracting light for a fishing boat, characterized in that, The control method includes the following steps: The control unit receives data from the sampling unit, which collects the voltage of the ship's electrical grid, the current of the three-phase PWM rectifier unit, and the voltage of the high-voltage DC bus. The control unit tracks the phase and frequency of the voltage in the ship's electrical grid through a PLL phase-locked loop unit to adjust the phase and frequency of the voltage in the three-phase PWM rectifier unit. The coordinate transformation unit performs Clark and Park transformations on the current collected from the three-phase PWM rectifier unit to obtain the d-axis current and q-axis current. The voltage outer loop unit generates d-axis current commands based on the difference between the target voltage and the actual voltage of the high-voltage DC bus, and sets q-axis current commands according to actual needs. The inner current loop unit outputs the target d-axis voltage command based on the difference between the generated d-axis current command and the obtained d-axis current, and outputs the target q-axis voltage command based on the difference between the set q-axis current command and the obtained q-axis current. The coordinate transformation unit performs inverse Clark transformation and inverse Park transformation on the target d-axis voltage command and the target q-axis voltage command to obtain the output value; The SVPWM modulation unit generates a PWM signal based on the output value; The drive unit drives the three-phase PWM rectifier unit according to the PWM signal, so that the three-phase PWM rectifier unit converts the received output voltage into a voltage within a set range; The DC bus capacitor unit receives DC current with a voltage within a set range to form a high-voltage DC bus with a voltage within a set range; The subsequent DC / DC unit converts the voltage of the high-voltage DC bus within a set range into the operating voltage of the LED fish-attracting lamp.

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