Wind farm reactive power loss reduction cabinet

Abstract

A cabinet for reducing reactive power loss in wind farms is disclosed. The cabinet has a closed structure. An input protection module is located within the cabinet; a varistor absorbs voltage spikes at the input terminal, and an NTC thermistor's resistance decreases as its temperature rises after power-on, reducing startup shock. An MI filter module is also located within the cabinet, comprising a cross-line capacitor, a line-to-ground capacitor, and a common-mode inductor. An output module is also located within the cabinet; a startup resistor provides the initial operating voltage to the PWM controller, a discharge resistor releases the charge stored in the X capacitor after power-off, and a TVS diode suppresses output surge voltage to protect the load equipment.

Description

Technical Field

[0001] This utility model relates to the field of reactive power loss reduction technology in wind farms, and in particular to a cabinet for reactive power loss reduction in wind farms. Background Technology

[0002] Wind farms are prone to increased node voltage deviations, reactive power circulating currents, and line losses due to wind speed fluctuations and changes in grid reactive power demand. Traditional reactive power control methods rely on centralized SCADA systems, which have slow response speeds and poor scalability, making them difficult to adapt to the real-time optimization needs of multiple nodes. In existing technologies, distributed control devices (such as SVG and SVC) can locally adjust reactive power, but they lack global coordination strategies and fast-break protection mechanisms in case of faults.

[0003] The information disclosed in the background section is only intended to enhance the understanding of the background of this utility model, and therefore may contain information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0004] To address the shortcomings or defects of the existing technology, a cabinet for reducing reactive power loss in wind farms is provided, which can quickly provide fuse protection.

[0005] The purpose of this utility model is achieved through the following technical solutions.

[0006] A cabinet for reducing reactive power loss in wind farms includes,

[0007] The cabinet is a closed structure;

[0008] An input protection module, located within the cabinet, includes,

[0009] A varistor absorbs voltage spikes at its input terminal.

[0010] NTC thermistors have a lower resistance as their temperature rises after being powered on, thus reducing startup shock.

[0011] The MI filter module is located in the cabinet and includes a cross-line capacitor, a line-to-ground capacitor, and a common-mode inductor.

[0012] An output module, located within the cabinet, includes...

[0013] The startup resistor provides the initial operating voltage to the PWM controller.

[0014] The discharge resistor releases the charge stored in capacitor X after power is turned off.

[0015] TVS diodes suppress surge voltage at the output terminal, protecting the load equipment.

[0016] The aforementioned wind farm reactive power reduction cabinet also includes a rectifier module located within the cabinet, which includes a rectifier bridge that converts AC power into pulsating DC power.

[0017] The aforementioned wind farm reactive power loss reduction cabinet also includes a primary-side filter module located in the cabinet, which includes a high-voltage electrolytic capacitor for smoothing rectified high-voltage DC.

[0018] The wind farm reactive power loss reduction cabinet also includes a secondary-side rectification and filtering module, which includes a Schottky diode for rectifying high-frequency low-voltage AC power and an LC filter circuit for smoothing pulsating DC power after rectification.

[0019] The aforementioned wind farm reactive power loss reduction cabinet also includes a switching conversion module located in the cabinet, which includes a PWM controller that generates high-frequency pulse signals and a power switching transistor that switches quickly according to the PWM signals.

[0020] In the aforementioned wind farm reactive power loss reduction cabinet, the switching module also includes a high-frequency transformer that isolates the input and output sides.

[0021] The aforementioned wind farm reactive power loss reduction cabinet also includes a voltage regulation feedback module located in the cabinet, which includes an optocoupler that isolates the primary side from the secondary side, an overcurrent protection resistor that detects the primary side current, and an RCD absorption circuit that absorbs voltage spikes when the switch is turned off.

[0022] The aforementioned wind farm reactive power loss reduction cabinet also includes a control board located inside the cabinet, which includes a main control unit, a communication module, a power management module, a storage module, an input / output module, and a protection and monitoring module.

[0023] The aforementioned wind farm reactive power loss reduction cabinet also includes a serial port expansion board located inside the cabinet, which includes a main control and protocol conversion module, an RS485 transceiver module, and a power supply and isolation power supply module.

[0024] In the aforementioned cabinet for reducing reactive power loss in wind farms, the cabinet body has a symmetrical structure.

[0025] Compared with the prior art, the beneficial effects of this utility model are: this utility model can improve the protection of fuses and reduce risks.

[0026] The description is merely an overview of the technical solution of this utility model. In order to make the technical means of this utility model clearer and more understandable, so that those skilled in the art can implement it according to the contents of the specification, and in order to make the described and other objects, features and advantages of this utility model more obvious and easy to understand, specific embodiments of this utility model are illustrated below. Attached Figure Description

[0027] Various other advantages and benefits of this invention will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this invention. Obviously, the drawings described below are merely some embodiments of this invention, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. Furthermore, the same reference numerals denote the same parts throughout the drawings.

[0028] In the attached diagram:

[0029] Figure 1 This is a schematic diagram of the structure of this utility model;

[0030] Figure 2 This is a schematic diagram of the circuit board of this utility model;

[0031] Figure 3 This is a schematic diagram of the control board of this utility model;

[0032] Figure 4 This is a schematic diagram of the serial port expansion board of this utility model.

[0033] The present invention will be further explained below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0034] Specific embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While specific embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0035] It should be noted that certain terms are used in the specification and claims to refer to specific components. Those skilled in the art will understand that different terms may be used to refer to the same component. This specification and claims do not distinguish components based on differences in terminology, but rather on differences in function. The terms "comprising" or "including" used throughout the specification and claims are open-ended and should be interpreted as "comprising but not limited to." The following descriptions of the preferred embodiments of the present invention are for the purpose of implementing the general principles of the specification and are not intended to limit the scope of the present invention. The scope of protection of this invention shall be determined by the appended claims.

[0036] To facilitate understanding of the embodiments of this utility model, the following will provide further explanation and description with reference to the accompanying drawings and several specific embodiments. The accompanying drawings do not constitute a limitation on the embodiments of this utility model.

[0037] To better understand, such as Figures 1 to 4 As shown, a cabinet for reducing reactive power loss in a wind farm includes,

[0038] The cabinet is a closed structure;

[0039] An input protection module, located within the cabinet, includes,

[0040] A varistor absorbs voltage spikes at its input terminal.

[0041] NTC thermistors have a lower resistance as their temperature rises after being powered on, thus reducing startup shock.

[0042] The MI filter module is located in the cabinet and includes a cross-line capacitor, a line-to-ground capacitor, and a common-mode inductor.

[0043] An output module, located within the cabinet, includes...

[0044] The startup resistor provides the initial operating voltage to the PWM controller.

[0045] The discharge resistor releases the charge stored in capacitor X after power is turned off.

[0046] TVS diodes suppress surge voltage at the output terminal, protecting the load equipment.

[0047] In a preferred embodiment of the wind farm reactive power loss reduction cabinet, it further includes a rectifier module disposed in the cabinet, which includes a rectifier bridge that converts AC power into pulsating DC power.

[0048] In a preferred embodiment of the wind farm reactive power loss reduction cabinet, it further includes a primary-side filter module located in the cabinet, which includes a high-voltage electrolytic capacitor for smoothing rectified high-voltage DC.

[0049] In a preferred embodiment of the wind farm reactive power loss reduction cabinet, it further includes a secondary-side rectification and filtering module located in the cabinet, which includes a Schottky diode for rectifying high-frequency low-voltage AC power and an LC filter circuit for smoothing the pulsating DC power after rectification.

[0050] In a preferred embodiment of the wind farm reactive power loss reduction cabinet, it further includes a switch conversion module located in the cabinet, which includes a PWM controller that generates high-frequency pulse signals and a power switch tube that switches quickly according to the PWM signals.

[0051] In a preferred embodiment of the wind farm reactive power loss reduction cabinet, the switching module further includes a high-frequency transformer that isolates the input and output sides.

[0052] In a preferred embodiment of the wind farm reactive power loss reduction cabinet, it also includes a voltage regulation feedback module located in the cabinet, which includes an optocoupler that isolates the primary side from the secondary side, an overcurrent protection resistor that detects the primary side current, and an RCD absorption circuit that absorbs voltage spikes when the switch is turned off.

[0053] In a preferred embodiment of the wind farm reactive power loss reduction cabinet, a control board is also provided inside the cabinet, which includes a main control unit, a communication module, a power management module, a storage module, an input / output module, and a protection and monitoring module.

[0054] In a preferred embodiment of the wind farm reactive power loss reduction cabinet, a serial port expansion board is also provided inside the cabinet, which includes a main control and protocol conversion module, an RS485 transceiver module, and a power supply and isolation power supply module.

[0055] In a preferred embodiment of the wind farm reactive power loss reduction cabinet, the cabinet has a symmetrical structure.

[0056] In one embodiment, in the input protection module, the varistor absorbs voltage spikes at the input terminal (such as lightning strikes or power grid fluctuations) to prevent high voltage damage to the circuit. The NTC thermistor suppresses inrush current during startup. It has a high resistance at room temperature, and its resistance decreases as the temperature rises after power-on, reducing startup impact; it melts when overcurrent or short circuit occurs in the circuit, cutting off the power supply to protect subsequent circuits. Connection method: The live wire (L) and neutral wire (N) pass through the following in sequence: fuse (in series) → varistor MOV (parallel to L / N) → NTC thermistor (in series) → X capacitor (bridging L / N) → common-mode inductor (two sets of coils wound on a magnetic ring for L / N) → Y capacitor (L / N connected in parallel to ground). The MOV is connected in parallel after the fuse to absorb surge voltage; the NTC is connected in series at the input front end to suppress startup inrush current; the common-mode inductor + X / Y capacitor constitute an EMI filter to suppress high-frequency noise. In the EMI filtering module, the X capacitor (cross-line capacitor) filters out differential-mode interference (high-frequency noise between the live wire and neutral wire). Y-capacitor (line-to-ground capacitor): Filters common-mode interference (high-frequency noise from live / neutral wires to ground), and must meet safety standards (e.g., Y1 / Y2). Common-mode inductor: Suppresses common-mode noise through the magnetic core winding, preventing high-frequency interference from entering the power grid or equipment. Connection method: The filtered AC power (L / N) is connected to the AC input terminal of the rectifier bridge. In the rectifier module, the rectifier bridge: Converts AC220V AC power to pulsating DC power (approximately 310V DC). The DC output terminal (+) of the rectifier bridge is connected to the positive terminal of the high-voltage electrolytic capacitor, and the negative terminal is connected to the (-) terminal of the rectifier bridge. The high-voltage capacitor smooths the pulsating DC power after rectification, supplying power to the switching module. Connection method: Connected in parallel across the primary winding of the transformer, consisting of a resistor, capacitor, and diode connected in series, absorbing voltage spikes when the switch is turned off. In the primary-side filter module, the high-voltage electrolytic capacitor: Smooths the high-voltage DC power after rectification, reduces voltage ripple, and stores energy. Connection method: The (+) terminal of the high-voltage capacitor is connected to one end of the primary winding of the high-frequency transformer, and the other end is connected to the drain (D) of the power switching transistor (MOSFET); the source (S) of the MOSFET is connected to the primary side ground via a current sensing resistor; the OUT pin of the PWM controller (such as UC3844) drives the MOSFET gate (G), controlling its switching frequency and duty cycle; the start-up resistor is connected from the (+) terminal of the high-voltage capacitor to the VCC pin of the PWM controller to provide initial power; the auxiliary winding of the transformer subsequently provides continuous power to the controller through diode rectification. In the switching conversion module, the PWM controller generates a high-frequency pulse signal to control the switching frequency and duty cycle of the switching transistor, regulating energy transfer. The power switching transistor switches rapidly according to the PWM signal, converting DC power into high-frequency AC power input to the transformer. The high-frequency transformer isolates the input and output sides, reducing the high-voltage AC to low-voltage AC (such as 12V) through the turns ratio.Connection method: The transformer secondary winding outputs low-voltage AC power, which is connected to a Schottky diode (positive terminal connected to one end of the winding, negative terminal as the output positive terminal); the negative terminal of the diode is connected to an LC filter circuit; the filter inductor (in series) → the output filter capacitor (positive terminal connected to the inductor, negative terminal connected to the secondary side ground); the secondary side ground is isolated from the primary side ground through a Y capacitor to ensure safety.

[0057] In the secondary-side rectification and filtering module, Schottky diodes rectify high-frequency, low-voltage AC power (low forward voltage drop, suitable for high-frequency applications). The LC filter circuit smooths the pulsating DC after rectification, outputting a stable 12V DC. Connection method: The secondary-side output voltage (12V) is connected to the reference terminal (REF) of the voltage reference TL431 through a voltage divider resistor. The TL431 adjusts the cathode current to control the brightness of the internal LED of the optocoupler. The output terminal (transistor side) of the optocoupler is connected to the feedback pin of the PWM controller (such as the FB pin of the UC3844) to transmit the voltage error signal. When the output voltage increases, the optocoupler current increases, and the PWM controller reduces the duty cycle to achieve closed-loop voltage regulation. In the voltage regulation feedback module, the optocoupler isolates the primary and secondary sides, transmits the output voltage feedback signal, and ensures safety. The voltage reference accurately detects the output voltage, compares it with the reference voltage, adjusts the optocoupler current, and controls the PWM duty cycle to regulate the voltage. The overcurrent protection resistor detects the primary-side current and triggers the PWM controller to turn off the switching transistor to prevent overload. RCD snubber circuit: Absorbs voltage spikes when the switching transistor is turned off, protecting the MOSFET from breakdown. Connection method: Output filter capacitor (low ESR electrolytic capacitor + ceramic capacitor): Further filters out high-frequency noise, ensuring a clean output voltage. The voltage of the current sensing resistor (from primary side ground to MOSFET source) is fed into the current sensing pin of the PWM controller (such as ISENSE of UC3844), triggering overcurrent shutdown. In the output module, the startup resistor: Provides the initial operating voltage to the PWM controller until the transformer power supply is normal. The discharge resistor: Releases the charge stored in the X capacitor after power failure, avoiding the risk of electric shock. TVS diode: Suppresses output surge voltage, protecting the load device. Connection method: Connect to the CMA core circuit board and the SPI to 16-channel 485 window serial port expansion board; add a TVS diode on the secondary side (connected in parallel at the output), or limit the maximum duty cycle through a feedback loop. A self-resetting fuse (overcurrent protection) is connected in series with the 12V output positive terminal, and a TVS diode is connected in parallel (absorbs transient high voltage). The discharge resistor is connected in parallel across the X capacitor (releases residual charge after input power failure).

[0058] In one embodiment, the main control unit's MCU core processor executes the system's main program and coordinates task scheduling for various modules (such as data acquisition, communication protocol processing, and logic control). It supports network protocols such as TCP / IP, MQTT, and HTTP, adapting to 4G communication requirements. Connection methods include: connecting to the internal buffer via AXI / bus; controlling the connection to the 4G module via UART using AT commands (e.g., via...); connecting sensors and the storage module via SPI; using USB for debugging or backup communication; and controlling external devices via GPIO interfaces. In the communication module, cellular network access supports LTE Cat-4 for data upload and remote control. SIM card management supports eSIM or physical SIM cards, automatically identifying operator networks, and includes a built-in baseband chip for RF signal modulation and demodulation. An RF switch switches between cellular and GPS antenna signals (if integrated with positioning functionality). Connection methods include: transmitting AT commands and data via UART (default baud rate 115200bps); connecting an external 4G antenna via an IPEX connector with 50Ω impedance matching; and independent DC-DC power supply to avoid digital noise interference with RF performance. In the power management module, the DC-DC converter offers multiple voltage outputs: converting input power (such as DC12V or battery) to 3.3V, 5V, and 1.2V (core voltage), etc. It adjusts the output voltage / current according to the load status (e.g., shutting down unused module power). The LDO regulator, TPS7A4700, provides overvoltage, overcurrent, and reverse connection protection and supports battery charge / discharge management (if a battery is included). Connection method: After the AC220V to DC12V board input filter capacitor, it is connected to the DC-DC converter. The battery is connected to the protection circuit via a PMOS transistor to prevent over-discharge. 3.3V powers the main control and 4G module digital section. 5V powers peripherals such as sensors and relays. 1.2V supplies power to the MCU core through the PMIC (Power Management IC). In the storage module, the W25Q128 (16MB SPI interface, storing firmware) stores the firmware code and bootloader. IS42S16400J (64Mb, extended RAM) data cache: temporarily stores sensor data and network communication packets. AT24C256 parameter storage: records device configuration (e.g., APN, server IP) and historical logs. Connection method: The program storage is directly connected to the main control SPI bus, and the chip select signal (CS) is controlled by GPIO. The data cache is directly connected to the MPU via a 32-bit data bus and address bus (equal-length wiring is required to reduce timing deviation). The parameter storage is connected to the main control I2C bus, and the address can be configured via hardware pins. In the input / output module, analog signal acquisition: acquires data from wind farm smart terminals (e.g., wind turbine controllers, transformer monitoring devices), meters (voltage / current sensors), and collects real-time active power (P), reactive power (Q), voltage (U), frequency (f), and temperature (T) data for each node. PWM output: controls the reactive power variables of each wind turbine.Connection method: External signals are connected via optocoupler isolation through an SPI-to-16-channel 485 window serial port expansion board and reported to the main controller via I2C. The main controller's TIMER pin directly drives a MOSFET (such as IRF540N) to control the load. In the protection and monitoring module, EMC protection suppresses surges, electrostatic discharge, and radio frequency interference (protecting I / O ports and communication lines). MAX706 watchdog chip monitors system crashes and forces a reset (independent timing, timeout resets the main controller). DS18B20 temperature sensor detects temperature and voltage anomalies and triggers protection (single bus interface, monitors PCB temperature). Connection method: EMC protection is connected in parallel to vulnerable nodes such as RS485, CAN, and power input. The watchdog is controlled by GPIO pulses; a timeout pulls the RESET pin low. The DS18B20 temperature sensor data line is connected to the main controller's GPIO, in parasitic power supply mode.

[0059] In one embodiment, the main control and protocol conversion module uses an SPI-to-multi-UART chip to convert the SPI interface into multiple independent UART channels (SC16IS752 supports 2 UART channels, requiring multiple chips to be cascaded to achieve 16 channels). It supports programmable baud rate (up to 3Mbps), data bits (5-8 bits), and parity bit configuration. A built-in FIFO buffer improves data throughput efficiency. The MCU (for complex protocol processing) coordinates the cascaded control of multiple SPI-UART chips, enabling dynamic channel allocation and data priority management. Connection method: A flexible flat cable connects to the CMA core control board host computer. The TXD (transmit) and RXD (receive) pins of each UART channel are connected to the corresponding RS485 transceiver. The INT signal notifies the main control of data readiness or error status. The MCU connects to the CS pins of multiple SPI-UART chips, using time-division multiplexing to control the transceiver's direction enable (DE / RE) via GPIO. In the RS485 transceiver module (16 channels), the RS485 transceiver converts the UART's TTL level to RS485 differential signals (A / B lines). It supports half-duplex communication with a maximum transmission rate of 10Mbps. The signal isolation chip provides electrical isolation between the UART signal and the RS485 side, eliminating ground loop interference and improving surge immunity. Connection method: The UART's TXD connects to DI (data input), RXD connects to RO (data output), and the DE (transmit enable) and RE (receive enable) pins are driven by the direction control module. A (positive) and B (negative) terminals are connected to the terminals after protection circuitry. The signal isolation chip's input side connects to the TXD / RXD of the main control or SPI-UART chip, and its output side connects to the RS485 transceiver's DI / RO. In the power supply and isolation power supply module, the isolated DC-DC module provides independent isolated power to each RS485 transceiver and isolation chip. It isolates the main control side (logic power) from the RS485 side (bus power). Connection method: The AC220V to DC12V circuit board is connected to the DC-DC input terminal after passing through a filter capacitor. Output distribution: Each RS485 module corresponds to an isolated power supply to prevent common-mode interference. In the signal direction control module, the logic gate circuit decodes the main control GPIO signal into multiple direction control signals to control the DE / RE pins of each RS485 transceiver, switching the transmit / receive state. Connection method: The input main control GPIO generates 16 control signals through logic gate combination, and each output control signal is connected to the DE / RE pin of the corresponding transceiver. The TXD signal drives the transistor through diodes and resistors to control the DE / RE pin level. In the protection and filtering module, the TVS diode suppresses surge voltage (such as lightning strikes and electrostatic discharge) of the RS485 port. The self-resetting fuse provides overcurrent protection, disconnecting when the current exceeds the threshold and automatically restoring after the fault is cleared. The common-mode choke filters out high-frequency common-mode interference and improves signal integrity.Connection method: A TVS diode is connected in parallel between the RS485 A / B line and ground to absorb instantaneous high voltage. A resettable fuse is connected in series in the RS485 power input path. A common-mode choke is connected in series on the RS485 A / B line, close to the transceiver output. In the terminal and interface module, the wiring terminals provide reliable RS485 signal and power connection interfaces. LED indicators display the transmit (TXD) and receive (RXD) status of each channel. Connection method: The wiring terminals are connected to the corresponding pins via the A / B line and the positive and negative power terminals, respectively. The LED indicators are connected to the UART's TXD / RXD signal lines via a current-limiting resistor (220Ω).

[0060] In one embodiment, this application also discloses a method for reducing reactive power loss in a wind farm, comprising the following steps:

[0061] Step 1: Initialize the configuration, which includes:

[0062] The AC220V to DC12V circuit board provides multiple stable power supplies, including 3.3V, 5V, and 1.2V, to the control board.

[0063] The DC-DC converter converts the input voltage (AC220V) to DC12V, and then the LDO regulator generates 3.3V (for communication modules and storage modules) and 5V (for sensors / relays) as power supply voltages.

[0064] Over-discharge is prevented by controlling the charging and discharging path through a PMOS transistor.

[0065] The 4G cellular module sends AT commands via UART to test network connectivity and verify SIM card status (eSIM or physical card) and operator network compatibility.

[0066] The RF switch switches between the 4G antenna and the GPS antenna (if the positioning function is integrated) to ensure signal stability;

[0067] An independent DC-DC power supply provides isolated power to the communication module, preventing digital noise from interfering with radio frequency performance;

[0068] The device configuration (such as APN, server IP, reactive power regulation threshold, etc.) is read through the storage module; if it is missing, the default value is used.

[0069] It also reads the firmware code and bootloader to ensure the subsequent logic runs;

[0070] Step 2: Data Acquisition and Processing

[0071] Real-time data is collected from wind farm smart terminals (such as wind turbine controllers and transformer monitoring devices) via an SPI-to-16-channel RS485 serial port expansion board, including:

[0072] Node voltage (U)

[0073] Active power (P)

[0074] Reactive power (Q)

[0075] Frequency (f)

[0076] Temperature (T)

[0077] After being isolated by an optical coupler, the data is transmitted to the control board via an RS485 bus;

[0078] Based on preset logic (such as power factor threshold), the MOSFET is driven through GPIO pins to adjust the reactive power output of the fan;

[0079] The protection and monitoring module is invoked to detect anomalies, including: TVS diodes suppressing surge voltages (such as lightning strikes and electrostatic discharge) at the RS485 port; and a resettable fuse that trips when the current exceeds a threshold and automatically resets after the fault is cleared.

[0080] A single-bus temperature sensor detects the PCB temperature. If the temperature exceeds the limit (e.g., 70°C), it triggers a watchdog reset and sends an alarm message.

[0081] The primary-side current sensing resistor monitors the current of the PWM controller, and if an overcurrent occurs, it triggers the shutdown protection.

[0082] Step 3: Reactive power compensation control, specifically including:

[0083] The power factor (cosφ) is calculated based on the collected P and Q data. If cosφ is lower than the set threshold (e.g., 0.95), the reactive power compensation logic is triggered.

[0084] A PWM signal is generated through the TIMER pin to drive the MOSFET to adjust the capacitor / inductor switching amount and dynamically change the reactive power output.

[0085] Real-time monitoring of output voltage stability and correction of PWM signal;

[0086] Receive control commands from the cloud via 4G network (such as manually switching reactive power compensation devices).

[0087] Adjust the PWM duty cycle according to the instructions to change the reactive power output of the fan.

[0088] Step 4: Communication and data upload, specifically including:

[0089] The collected P, Q, U, f, T and other data are encapsulated into MQTT / HTTP protocol packets and uploaded to the cloud server via a 4G module for remote monitoring and analysis.

[0090] If an overcurrent, overvoltage, overtemperature, or fuse failure event is detected, the communication module immediately sends an alarm message to the operation and maintenance platform.

[0091] Step 5: Fault protection and circuit breaker mechanism, specifically including:

[0092] If the NTC thermistor is detected to have blown due to overcurrent, the AC220V input path will be cut off.

[0093] After the power is cut off, the discharge resistor releases the charge stored in the X capacitor, thus avoiding the risk of electric shock.

[0094] When the output surge voltage exceeds the threshold, the TVS diode absorbs energy to protect the load equipment.

[0095] The watchdog chip monitors the system's operating status. If no reset signal is received within a timeout period (e.g., due to program freeze), the control board is forcibly reset.

[0096] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0097] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A cabinet for reactive power loss reduction of a wind farm, characterized in that, It includes, The cabinet is a closed structure; An input protection module, located within the cabinet, includes, A varistor absorbs voltage spikes at its input terminal. NTC thermistors have a lower resistance as their temperature rises after being powered on, thus reducing startup shock. The MI filter module is located in the cabinet and includes a cross-line capacitor, a line-to-ground capacitor, and a common-mode inductor. An output module, located within the cabinet, includes, The startup resistor provides the initial operating voltage to the PWM controller. The discharge resistor releases the charge stored in capacitor X after power is turned off. TVS diodes suppress output surge voltages to protect load equipment. The diodes also include a switchgear module housed in a cabinet, comprising a PWM controller that generates high-frequency pulse signals, a power switch transistor that rapidly switches according to the PWM signal, and a high-frequency transformer that isolates the input and output sides. It also includes a voltage regulation feedback module located in the cabinet, which includes an optocoupler isolating the primary and secondary sides, an overcurrent protection resistor for detecting the primary side current, and an RCD snubber circuit for absorbing voltage spikes when the switch is turned off. It also includes a control board located inside the cabinet, which includes a main control unit, a communication module, a power management module, a storage module, an input / output module, and a protection and monitoring module.

2. The cabinet for reactive loss reduction of a wind farm according to claim 1, wherein It also includes its rectifier module located in the cabinet, which includes a rectifier bridge that converts AC power into pulsating DC power.

3. The cabinet for reactive loss reduction of a wind farm according to claim 1, wherein It also includes a primary-side filter module located in the cabinet, which includes a high-voltage electrolytic capacitor for smoothing rectified high-voltage DC.

4. The cabinet for reactive loss reduction of a wind farm according to claim 1, wherein It also includes a secondary-side rectification and filtering module located in the cabinet, which includes a Schottky diode for rectifying high-frequency low-voltage AC power and an LC filter circuit for smoothing the pulsating DC power after rectification.

5. The cabinet for reducing reactive power loss in wind farms as described in claim 1, characterized in that, It also includes a serial port expansion board located inside the cabinet, which includes a main control and protocol conversion module, an RS485 transceiver module, and a power supply and isolation power supply module.

6. The cabinet for reactive loss reduction of a wind farm according to claim 1, wherein The cabinet has a symmetrical structure.

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