Offshore wind power loss reduction device
By simplifying the circuit structure of the offshore wind power loss reduction device through reactive power analog quantity acquisition and signal processing circuits, the problem of high cost of existing devices is solved, and efficient, low-cost reactive power compensation and flexible power control are achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HUADIAN (ZHEJIANG) NEW ENERGY CO LTD
- Filing Date
- 2024-12-25
- Publication Date
- 2026-06-16
Smart Images
Figure CN224367541U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the fields of power systems and offshore wind power generation technology, and in particular to an offshore wind power loss reduction device. Background Technology
[0002] Because submarine cable lines have a large positive-sequence capacitance, the charging power during normal operation often exceeds the sum of the line's reactive power loss and the load. This causes capacitive reactive power to flow back to the sending power source, increasing the voltage at the end. Therefore, secondary equipment for offshore wind power loss reduction devices is needed at offshore wind power plants, primarily for controlling the economic efficiency of electricity consumption. Current technology typically compensates for this by adding parallel reactors, which compensate for the difference between the line charging power and the line reactive power loss plus the end reactive power load. However, this method requires expensive primary equipment and systems, resulting in high costs for the loss reduction devices. Utility Model Content
[0003] This invention addresses the problem of high costs associated with existing offshore wind power loss reduction devices.
[0004] This utility model solves the above-mentioned technical problems through the following technical solution: an offshore wind power loss reduction device, the device including a reactive power analog quantity acquisition circuit, a signal processing circuit, a wind turbine communication circuit, and an SVG communication circuit. The reactive power analog quantity acquisition circuit includes multiple filter circuits and multiple analog quantity acquisition circuits. The input terminal of the filter circuit is connected to the reactive power analog quantity, the output terminal of the filter circuit is connected to the input terminal of the analog quantity acquisition circuit, the output terminal of the analog quantity acquisition circuit is connected to the input terminal of the signal processing circuit, the output terminal of the signal processing circuit is connected to the input terminal of the wind turbine communication circuit and the input terminal of the SVG communication circuit, respectively, the output terminal of the wind turbine communication circuit is connected to the wind turbine, and the output terminal of the SVG communication circuit is connected to the SVG.
[0005] This utility model discloses an offshore wind power loss reduction device. The reactive power analog quantity is input to the filter circuit, and the filtered signal is input to the analog quantity acquisition circuit. The analog quantity acquisition circuit converts the reactive power analog quantity into a digital quantity and inputs it to the signal processing circuit. The signal processing circuit outputs the reactive power demand and sends it to the wind turbine through the wind turbine communication circuit and to the SVG through the SVG communication circuit. The loss is reduced on the submarine cable through the wind turbine and the SVG respectively. The circuit structure is simple. It only needs to collect the electrical quantities of the nodes involved in the loss reduction and does not require high-resistance configuration, which can greatly reduce the investment cost of equipment.
[0006] Preferably, the reactive power analog quantities include the three-phase voltage of the outgoing line, the three-phase current of the outgoing line, the three-phase voltage of the low-voltage side of the main transformer, the three-phase current of the low-voltage side of the main transformer, the three-phase voltage of the high-voltage side bus of the transformer substation, and the three-phase current of the high-voltage side bus of the transformer substation.
[0007] Preferably, the filter circuit includes resistor RR7, resistor RR8, and capacitor CC4. One end of resistor RR8 is connected to the line where the acquisition point is located, and the other end of resistor RR8 is connected to the input terminal of the analog acquisition circuit and one end of capacitor CC4. The other end of capacitor CC4 is connected to the input terminal of the analog acquisition circuit and one end of resistor RR7. The other end of resistor RR7 is grounded.
[0008] Preferably, the analog signal acquisition circuit includes chip U15, resistors R27, R30, R35-R37, R44, R45, capacitors C52, C56, C60, C61, C72, C75, C77, C88, and C92. The first pin of chip U15 is connected to one end of capacitor C56 and the analog power supply AVCC, respectively. The other end of capacitor C56 is grounded. The second, forty-seventh, and twenty-sixth pins of chip U15 are connected together and then grounded. The thirty-eighth pin of chip U15 is connected to one end of capacitor C61 and the analog power supply AVCC, respectively. The other end of C61 is grounded. Pin 48 of chip U15 is connected to one end of capacitor C52 and the analog power supply AVCC, with the other end of capacitor C52 grounded. Pin 37 of chip U15 is connected to one end of capacitor C60 and the analog power supply AVCC, with the other end of capacitor C60 grounded. Pin 23 of chip U15 is connected to one end of capacitor C68 and the analog power supply AVCC, with the other end of capacitor C68 grounded. Pin 3 of chip U15 is connected in series with resistor R37 and then grounded. Pin 4 of chip U15 is connected in series with resistor R36 and then grounded. Pin 5 of chip U15 is connected in series with resistor R35 and then grounded. Pin 7 of chip U15 is connected in series with resistor R45 and then connected to a 3.3V voltage. Pin 34 of chip U15 is connected in series with resistor R44 and then grounded. Pin 43 of chip U15 is connected to one end of capacitor C88 and then grounded. Pin 42 of chip U15 is connected to the other end of capacitor C88 and then connected to the reference power supply VREF. Pins 44 and 45 of chip U15 are connected to one end of capacitor C92. Pin 46 of chip U15 is connected to the other end of capacitor C92 and then grounded. Pin 6 of chip U15 is connected in series with resistor R30 and then grounded. Pin 8 of chip U15 is connected in series with resistor R27 and then grounded. Pin 30 of chip U15... Pins 5, 40, and 41 are connected to ground. Pin 36 of chip U15 is connected to one end of capacitor C76 and one end of capacitor C77. The other end of capacitor C76 is connected to the other end of capacitor C77 and then grounded. Pin 39 of chip U15 is connected to one end of capacitor C72 and one end of capacitor C75. The other end of capacitor C72 and the other end of capacitor C75 are connected to ground. Pins 49 to 64 of chip U15 form eight signal channels for reactive power analog quantities. Each signal channel is connected to the output of the filter circuit. Pins 16 to 33 of chip U15 are all connected to the signal processing circuit.
[0009] Preferably, the signal processing circuit includes a main control chip U3, resistors R6, R90, R11, R10, and R9, and capacitors C24-C30. The ninth pin of the main control chip U3 is connected in series with resistor R6 and then connected to a crystal oscillator. The 173rd pin of the main control chip U3 is connected in series with resistor R90 and then connected to a 3.3V voltage. The 171st pin of the main control chip U3 is connected in series with resistor R11 and then connected to a 3.3V voltage. The 37th pin of the main control chip U3 is connected to capacitor C24. One end of capacitor C26 and one end of capacitor C27 are connected to ground. Pin 39 of the main control chip U3 is connected to the other ends of capacitors C26 and C27, respectively, and connected to a 3.3V voltage. Pin 125 of the main control chip U3 is connected in series with capacitor C25 and then grounded. Pin 81 of the main control chip U3 is connected in series with capacitor C24 and then grounded. Pin 38 of the main control chip U3 is connected to one end of capacitor C28 and one end of capacitor C29, respectively, and connected to a 3.3V voltage. The other end of capacitor C28 is connected to... The other end of capacitor C29 is connected to ground. The sixth pin of the main control chip U3 is connected in series with capacitor C30 and then grounded. The forty-eighth pin of the main control chip U3 is connected in series with resistor R9 and then grounded. The 166th pin of the main control chip U3 is connected in series with resistor R10 and then grounded. The thirty-third, forty-second, fifty-third, fifty-fourth, fifty-fifth, eightieth, one hundred and forty-fourth, one hundred and fifty-sixth, and one hundred and fifty-seventh pins of the main control chip U3 are all connected to the wind turbine communication circuit. The forty-first pin of the main control chip U3 is connected in series with resistor R70 and then connected to the wind turbine communication circuit. The 104th, 105th, 142nd, 143rd, sixty-eighth to seventy-eighth, and ninety-sixth to ninety-eighth pins of the main control chip U3 are connected to the sixteenth to thirty-third pins of chip U15 respectively. The ninety-second, ninety-third, and ninety-fourth pins of the main control chip U3 are all connected to the SVG communication circuit.
[0010] Preferably, the wind turbine communication circuit includes chips U21, U22, U28, resistors R64-R81, capacitors C115-C123, and capacitor C127. Pins 13, 16, 17, and 18 of chip U21 are respectively connected to pins 33, 80, 156, and 157 of the main control chip U3. Pin 8 of chip U21 is connected to pin 54 of the main control chip U3 and one end of resistor R67, with the other end of resistor R67 connected to 3.3V. Pin 7 of chip U21 is connected to pin 55 of the main control chip U3 and one end of resistor R68, with the other end of resistor R68 connected to 3.3V. Pin 10 of chip U21... Connected to resistor R64 in series and then grounded, pin 11 of chip U21 is connected to pin 53 of main control chip U3 and one end of resistor R69. The other end of resistor R69 is connected to 3.3V. Pin 12 of chip U21 is connected to resistor R66 in series and then connected to 3.3V. Pin 15 of chip U21 is connected to resistor R65 in series and then connected to 3.3V. Pin 14 of chip U21 is connected to resistor R70 in series and then connected to pin 41 of main control chip U3. Pin 25 of chip U21 is connected to one end of capacitor C115, one end of capacitor C116, and one end of capacitor C117 and then grounded. The other ends of capacitors C115 and C116 are connected to pin 6 of chip U21. Pin 9 of U21 is connected to the other end of capacitor C117 and connected in parallel with a 3.3V voltage. Pin 1 of chip U21 is connected to pin 19, then connected to one end of capacitor C118 and one end of capacitor C119, connected in parallel with a 3.3V voltage. The other end of capacitor C118 and the other end of capacitor C119 are connected to ground. Pin 24 of chip U21 is connected in series with resistor R71 and then grounded. Pin 2 of chip U21 is connected in series with resistor R72 and then grounded. Pin 3 of chip U21 is connected in series with resistor R73 and then grounded. Pin 1 of chip U22 is connected to pin 21 of chip U21 and one end of resistor R74. Pin 2 of chip U22 is connected to one end of capacitor C122 and connected in parallel with a 3.3V voltage. The other end of capacitor C122... One end is grounded. The third pin of chip U22 is connected to the twentieth pin of chip U21 and one end of resistor R75. The other ends of resistor R74 and R75 are connected together and then connected to one end of capacitor C120 with a voltage of 3.3V. The other end of capacitor C120 is grounded. The sixth pin of chip U22 is connected to the twenty-third pin of chip U21 and one end of resistor R77. The seventh pin of chip U22 is connected to one end of capacitor C123 with a voltage of 3.3V. The other end of capacitor C123 is grounded. The eighth pin of chip U22 is connected to the twenty-second pin of chip U21 and one end of resistor R76. The other ends of resistor R76 and R77 are connected together and then connected to one end of capacitor C121 with a voltage of 3.3V.With a 3V voltage, the other end of capacitor C121 is grounded. Pin 9 of chip U22 is connected to pin 6 of chip U28. Pin 10 of chip U22 is connected to one end of resistor R78. Pin 15 of chip U22 is connected to one end of resistor R79. The other ends of resistors R78 and R79 are connected together and then connected to one end of resistors R80 and R81 respectively, and then to one end of capacitor C127. The other end of capacitor C127 is grounded. Pin 11 of chip U22 is connected to pin 3 of chip U28. Pins 4 and 5 of chip U28 are connected and then connected to the other end of resistor R80. Pins 7 and 8 of chip U28 are connected and then connected to the other end of resistor R81. Pin 14 of chip U22 is connected to pin 2 of chip U28. Pin 16 of chip U22 is connected to pin 1 of chip U28. Pins 9 and 10 of chip U28 are connected and then grounded.
[0011] Preferably, the SVG communication circuit includes chip U35, chip U36, resistors R101, R116, and R117, capacitors C166 and C168. The first pin of chip U35 is connected to one end of capacitor C166 and connected to a 3.3V voltage. The second pin of chip U35 is connected to the other end of capacitor C166 and then grounded. The third pin of chip U35 is connected to the 93rd pin of the main control chip U3 and one end of resistor R101, with the other end of resistor R101 connected to a 3.3V voltage. The fourth and fifth pins of chip U35 are connected to the 94th pin of the main control chip U3. The sixth pin of chip U35 is connected to the 92nd pin of the main control chip U3. The seventh and eighth pins of chip U35 are connected to grounded. The ninth pin of chip U35... Connect the analog power supply GNDiso1. Pins 12 and 13 of chip U35 are connected in series with fuses F3 and F4 respectively and then connected to the external RS485 terminal. Fuse F3 and pin 12 of chip U35 are connected to one end of resistor R116 and pin 1 of chip U36 respectively. Pin 13 of chip U35 is connected to one end of resistor R117 and pin 2 of chip U36 respectively. Pin 3 of chip U36 and the other end of resistor R117 are both connected to analog power supply GNDiso1. The other end of resistor R116 is connected to analog power supply 5Viso1. Pin 15 of chip U35 is connected to one end of capacitor C168 and connected to analog power supply GNDiso1. Pin 16 of chip U35 is connected to the other end of capacitor C168 and connected to analog power supply 5Viso1.
[0012] Preferably, the chip U15 is model AD7606BSTZ and the main control chip U3 is model STM32F767IGT6.
[0013] Preferably, the chip U21 is model LAN8720A, the chip U22 is model H1102NL, and the chip U28 is model MJ5985-BX11-RB1.
[0014] Preferably, the model number of chip U35 is ISO3082DW, and the model number of chip U36 is PSM712-LF-T7.
[0015] The advantages provided by this utility model are:
[0016] (1) The offshore wind power loss reduction device of this utility model inputs reactive analog quantity into the filter circuit and the signal after filtering is input into the analog quantity acquisition circuit. The analog quantity acquisition circuit converts the reactive analog quantity into digital quantity and inputs it into the signal processing circuit. The signal processing circuit outputs the reactive demand and sends it to the wind turbine through the wind turbine communication circuit and to the SVG through the SVG communication circuit. The loss is reduced on the submarine cable through the wind turbine and the SVG respectively. The circuit structure is simple. It only needs to collect the electrical quantities of the nodes involved in the loss reduction. There is no need to use high-resistance configuration, which can greatly reduce the cost of equipment.
[0017] (2) In the offshore wind power loss reduction device of this utility model, the analog signal acquisition circuit adopts multiple 8-channel 16-bit analog-to-digital conversion circuits, and the sampling signal is processed synchronously to ensure the consistency of the acquisition of each electrical quantity signal. The signal processing circuit is implemented by a single microcontroller, and a simple peripheral circuit is added to form a minimum system. It has low cost and high real-time performance. The wind turbine communication circuit is directly connected to the signal processing circuit through the integrated MAC network interface chip, without the need to add an extra circuit. The SVG communication circuit is directly connected to the signal processing circuit through a high-speed RS485 chip, without the need to add an extra circuit. Moreover, the communication rate is configurable, flexible and simple, and supports the parallel access of multiple SVGs. Attached Figure Description
[0018] Figure 1 Structural block diagram of the offshore wind power loss reduction device provided in this embodiment of the utility model;
[0019] Figure 2 A circuit diagram of the filter circuit in the offshore wind power loss reduction device provided in this embodiment of the utility model;
[0020] Figure 3 A circuit diagram of the analog signal acquisition circuit in the offshore wind power loss reduction device provided in this embodiment of the utility model;
[0021] Figure 4 A circuit diagram of the signal processing circuit in the offshore wind power loss reduction device provided in this embodiment of the utility model;
[0022] Figure 5 A partial circuit diagram of the wind turbine communication circuit in the offshore wind power loss reduction device provided in this embodiment of the utility model;
[0023] Figure 6 Another part of the circuit diagram of the wind turbine communication circuit in the offshore wind power loss reduction device provided in this embodiment of the utility model;
[0024] Figure 7 A circuit diagram of the SVG communication circuit in the offshore wind power loss reduction device provided in this embodiment of the utility model;
[0025] Figure 8 An exemplary structural block diagram of the offshore wind power loss reduction device provided in this embodiment of the utility model;
[0026] Figure 9 A schematic diagram showing the location of the data collection point for the offshore wind power loss reduction device provided in this embodiment of the utility model. Detailed Implementation
[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model are described clearly and completely below with reference to specific embodiments and accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.
[0028] like Figure 1 As shown, this embodiment provides an offshore wind power loss reduction device, including a reactive power analog quantity acquisition circuit, a signal processing circuit, a wind turbine communication circuit, and an SVG communication circuit. The reactive power analog quantity acquisition circuit includes multiple filtering circuits and multiple analog quantity acquisition circuits. The input terminal of the filtering circuit is connected to the reactive power analog quantity, and the output terminal of the filtering circuit is connected to the input terminal of the analog quantity acquisition circuit. The output terminal of the analog quantity acquisition circuit is connected to the input terminal of the signal processing circuit. The output terminal of the signal processing circuit is connected to the input terminal of the wind turbine communication circuit and the input terminal of the SVG communication circuit, respectively. The output terminal of the wind turbine communication circuit is connected to the wind turbine, and the output terminal of the SVG communication circuit is connected to the SVG. The reactive power analog quantity is input to the filtering circuit, and the filtered signal is input to the analog quantity acquisition circuit. The analog quantity acquisition circuit converts the reactive power analog quantity into a digital quantity and inputs it to the signal processing circuit. The signal processing circuit calculates and outputs the reactive power demand based on the reactive power analog quantity and sends it to the wind turbine through the wind turbine communication circuit and to the SVG (Static Var Generator) through the SVG communication circuit. The wind turbine and SVG reduce the loss of the submarine cable.
[0029] The circuit structure of this utility model offshore wind power loss reduction device is simple. It only needs to collect the electrical quantities of the nodes involved in loss reduction and input them into the signal processing circuit. The signal processing circuit sends the reactive power demand to the wind turbine through the wind turbine communication circuit and to the SVG through the SVG communication circuit. It integrates the wind turbine communication circuit and the SVG communication circuit, which is low in cost and simple to implement. It does not require high-resistance configuration, which can greatly reduce the investment in equipment costs and has good economic benefits.
[0030] The analog signal acquisition circuit uses three 8-channel 16-bit analog-to-digital converters to synchronously process the sampled signals, ensuring the consistency of signal acquisition for each electrical quantity. This includes chip U15, resistors R27, R30, R35-R37, R44, R45, capacitors C52, C56, C60, C61, C72, C75, C77, C88, and C92. Chip U15 is model AD7606BSTZ. The first pin of chip U15 is connected to one end of capacitor C56 and the analog power supply AVCC, while the other end of capacitor C56 is grounded. The second pin of chip U15... Pin 26 of chip U15 is connected to ground. Pin 38 of chip U15 is connected to one end of capacitor C61 and the analog power supply AVCC, with the other end of capacitor C61 grounded. Pin 48 of chip U15 is connected to one end of capacitor C52 and the analog power supply AVCC, with the other end of capacitor C52 grounded. Pin 37 of chip U15 is connected to one end of capacitor C60 and the analog power supply AVCC, with the other end of capacitor C60 grounded. Pin 23 of chip U15 is connected to one end of capacitor C68 and the analog power supply AVCC, with the other end of capacitor C68 grounded. Pin 3 of chip U15 is connected in series with resistor R37 and then grounded. Pin 4 of chip U15 is connected in series with resistor R36 and then grounded. Pin 5 of chip U15 is connected in series with resistor R35 and then grounded. Pin 7 of chip U15 is connected in series with resistor R45 and then connected to 3.3V. Pin 34 of chip U15 is connected in series with resistor R44 and then grounded. Pin 43 of chip U15 is connected to one end of capacitor C88 and then grounded. Pin 42 of chip U15 is connected to the other end of capacitor C88 and then connected to the reference power supply VREF. Pins 44 and 45 of chip U15 are connected to one end of capacitor C92. Pin 46 of chip U15 is connected to the other end of capacitor C92 and then grounded. Pin 6 of chip U15 is connected to... Resistor R30 is connected in series and then grounded. Pin 8 of chip U15 is connected in series with resistor R27 and then grounded. Pins 35, 40, and 41 of chip U15 are connected together and then grounded. Pin 36 of chip U15 is connected to one end of capacitor C76 and one end of capacitor C77, respectively. The other end of capacitor C76 is connected to the other end of capacitor C77 and then grounded. Pin 39 of chip U15 is connected to one end of capacitor C72 and one end of capacitor C75, respectively. The other ends of capacitor C72 and the other end of capacitor C75 are connected together and then grounded. Pins 49 to 64 of chip U15 form eight signal channels for reactive power analog input, used to input reactive power analog input. The analog power supply AVCC is 3.3V.Pins 16 to 33 of chip U15 are connected sequentially to pins 104, 105, 142, 143, 68 to 78, and 96 to 98 of the main control chip U3 in the signal processing circuit.
[0031] The reactive power analog quantities include the three-phase voltage and current of the outgoing lines, the three-phase voltage and current of the low-voltage side of the main transformer, the three-phase voltage and current of the high-voltage side bus of the transformer substation, and the three-phase current of the high-voltage side bus of the transformer substation. This utility model needs to collect 18 reactive power analog quantities. Each reactive power analog quantity needs to be processed by a filtering circuit before being input into the analog signal channel of the analog quantity acquisition circuit. Therefore, this utility model requires 18 filtering circuits and 18 analog signal channels. Each chip U15 supports the input of 8 channel signals, so at least three analog quantity acquisition circuits are needed to realize the acquisition and processing of 18 reactive power analog signals.
[0032] Taking pins 49 and 50 of chip U15 as an analog channel as an example, the output of a filter circuit is connected to pins 49 and 50 of chip U15. The filter circuit includes resistor RR7, resistor RR8, and capacitor CC4. One end of resistor RR8 is connected to the line where the acquisition point is located. The other end of resistor RR8 is connected to pin 49 of chip U15 and one end of capacitor CC4. The other end of capacitor CC4 is connected to pin 50 of chip U15 and one end of resistor RR7. The other end of resistor RR7 is grounded. Similarly, pins 51 and 52 of chip U15 form one analog channel, pins 53 and 54 form another, pins 55 and 56 form another, pins 57 and 58 form another, pins 59 and 60 form another, pins 61 and 62 form another, and pins 63 and 64 form yet another. The filtering circuit connected to the front end of each analog channel is the same, and will not be described further here.
[0033] The signal processing circuit is implemented using a microcontroller, with simple peripheral circuits added to form a minimal system. This results in low cost and high real-time performance. The system includes a main control chip U3, resistors R6, R90, R11, R10, and R9, and capacitors C24-C30. The main control chip U3 is an STM32F767IGT6. Pin 9 of the main control chip U3 is connected in series with resistor R6 to a 32768Hz crystal oscillator. Pin 173 of the main control chip U3 is connected in series with resistor R90 to a 3.3V voltage. Pin 171 of the main control chip U3 is connected in series with resistor R11 to a 3.3V voltage. Pin 37 of the main control chip U3 is connected to one end of capacitor C26 and one end of capacitor C27. The main control chip U3's 39th pin is connected to the other ends of capacitors C26 and C27, respectively, and then connected to a 3.3V voltage. The main control chip U3's 125th pin is connected in series with capacitor C25 and then grounded. The main control chip U3's 81st pin is connected in series with capacitor C24 and then grounded. The main control chip U3's 38th pin is connected to one end of capacitor C28 and one end of capacitor C29, respectively, and then connected to a 3.3V voltage. The other ends of capacitors C28 and C29 are connected to ground. The main control chip U3's 6th pin is connected in series with capacitor C30 and then grounded. The main control chip U3's 48th pin is connected in series with resistor R9 and then grounded. The main control chip U3's 166th pin is connected to resistor R1... After being connected in series with 0, the system is grounded. The 31st pin of the main control chip U3 is connected to the reset signal. The 80th pin of the main control chip U3 is connected to the 16th pin of chip U21 in the wind turbine communication circuit. The 156th pin of the main control chip U3 is connected to the 17th pin of chip U21 in the wind turbine communication circuit. The 157th pin of the main control chip U3 is connected to the 18th pin of chip U21 in the wind turbine communication circuit. The 54th pin of the main control chip U3 is connected to the 8th pin of chip U21 in the wind turbine communication circuit. The 55th pin of the main control chip U3 is connected to the 7th pin of chip U21 in the wind turbine communication circuit. The 53rd pin of the main control chip U3 is connected to the 11th pin of chip U21 in the wind turbine communication circuit. Pin 33 of U3 is connected to pin 13 of chip U21 in the wind turbine communication circuit. Pin 42 of the main control chip U3 is connected to pin 12 of chip U21 in the wind turbine communication circuit. Pin 144 of the main control chip U3 is connected to pin 15 of chip U21 in the wind turbine communication circuit. Pin 41 of the main control chip U3 is connected in series with resistor R70 and then connected to pin 14 of chip U21 in the wind turbine communication circuit. Pins 104, 105, 142, 143, 68 to 78, and 96 to 98 of the main control chip U3 are connected to pins 16 to 33 of chip U15 in sequence.Pin 93 of the main control chip U3 is connected to pin 3 of chip U35 in the SVG communication circuit, pin 94 of the main control chip U3 is connected to pin 4 of chip U35 in the SVG communication circuit, and pin 92 of the main control chip U3 is connected to pin 6 of chip U35 in the SVG communication circuit.
[0034] The wind turbine communication circuit connects directly to the signal processing circuit via an integrated MAC network interface chip, eliminating the need for additional circuitry. This includes chips U21, U22, and U28, resistors R64-R81, capacitors C115-C123, and capacitor C127. Chip U21 is a LAN8720A, chip U22 is an H1102NL, and chip U28 is an MJ5985-BX11-RB1. Pin 16 of chip U21 connects to pin 80 of the main control chip U3, pin 17 of chip U21 connects to pin 156 of the main control chip U3, and pin 18 of chip U21 connects to pin 157 of the main control chip U3. Pin 8 of chip U21 is connected to pin 54 of main control chip U3 and one end of resistor R67. The other end of resistor R67 is connected to 3.3V. Pin 7 of chip U21 is connected to pin 55 of main control chip U3 and one end of resistor R68. The other end of resistor R68 is connected to 3.3V. Pin 10 of chip U21 is connected in series with resistor R64 and then grounded. Pin 11 of chip U21 is connected to pin 53 of main control chip U3 and one end of resistor R69. The other end of resistor R69 is connected to 3.3V. Pin 13 of chip U21 is connected to pin 33 of main control chip U3. Pin 12 of chip U21 is connected in series with resistor R66 and then connected to 3.3V. Pin 15 of chip U21 is connected in series with resistor R65 and then connected to a 3.3V voltage. Pin 14 of chip U21 is connected in series with resistor R70 and then connected to pin 41 of the main control chip U3. Pin 25 of chip U21 is connected to one end of capacitor C115, one end of capacitor C116, and one end of capacitor C117, and then grounded. The other end of capacitor C115 is connected to the other end of capacitor C116 and then connected to pin 6 of chip U21. Pin 9 of chip U21 is connected to the other end of capacitor C117 and then connected to a 3.3V voltage. Pin 1 and pin 19 of chip U21 are connected to one end of capacitor C118 and one end of capacitor C119 and then connected to a 3.3V voltage. The other end of capacitor C118... One end of the capacitor is connected to the other end of capacitor C119 and then grounded. The 24th pin of chip U21 is connected in series with resistor R71 and then grounded. The second pin of chip U21 is connected in series with resistor R72 and then grounded. The third pin of chip U21 is connected in series with resistor R73 and then grounded. The first pin of chip U22 is connected to the 21st pin of chip U21 and one end of resistor R74. The second pin of chip U22 is connected to one end of capacitor C122 and connected in parallel with a 3.3V voltage. The other end of capacitor C122 is grounded. The third pin of chip U22 is connected to the 20th pin of chip U21 and one end of resistor R75. The other ends of resistor R74 and R75 are connected together and then connected to one end of capacitor C120 and connected in parallel with a 3.3V voltage.A 3V voltage is applied, with the other end of capacitor C120 grounded. Pin 6 of chip U22 is connected to pin 23 of chip U21 and one end of resistor R77. Pin 7 of chip U22 is connected to one end of capacitor C123 and connected in parallel with a 3.3V voltage. The other end of capacitor C123 is grounded. Pin 8 of chip U22 is connected to pin 22 of chip U21 and one end of resistor R76. The other ends of resistors R76 and R77 are connected together and then connected to one end of capacitor C121 and connected in parallel with a 3.3V voltage. The other end of capacitor C121 is grounded. Pin 9 of chip U22 is connected to pin 6 of chip U28. Pin 10 of chip U22 is connected to one end of resistor R78. The pin 1... Pin 15 is connected to one end of resistor R79. The other ends of resistors R78 and R79 are connected together and then connected to one end of resistors R80 and R81 respectively, and finally to one end of capacitor C127. The other end of capacitor C127 is grounded. Pin 11 of chip U22 is connected to pin 3 of chip U28. Pins 4 and 5 of chip U28 are connected to the other end of resistor R80. Pins 7 and 8 of chip U28 are connected to the other end of resistor R81. Pin 14 of chip U22 is connected to pin 2 of chip U28. Pin 16 of chip U22 is connected to pin 1 of chip U28. Pins 9 and 10 of chip U28 are connected to ground. The external RJ45 interface of chip U28 is networked with the wind turbine EMS system.
[0035] The SVG communication circuit is directly connected to the signal processing circuit via a high-speed RS485 chip, requiring no additional circuitry. The communication rate is configurable, flexible, and simple, supporting parallel access of multiple SVGs. The circuit includes chips U35 and U36, resistors R101, R116, and R117, and capacitors C166 and C168. Chip U35 is model ISO3082DW, and chip U36 is model PSM712-LF-T7. The first pin of chip U35 is connected to one end of capacitor C166 and then to a 3.3V voltage. The second pin of chip U35 is connected to the other end of capacitor C166 and then grounded. The third pin of chip U35 is connected to pin 93 of the main control chip U3 and one end of resistor R101, with the other end of resistor R101 connected to a 3.3V voltage. The fourth and fifth pins of chip U35 are connected to pin 94 of the main control chip U3. The sixth pin of chip U35 is connected to the [missing pin number]. The chip has 92 pins. Pins 7 and 8 of chip U35 are connected to ground. Pin 9 of chip U35 is connected to analog power supply GNDiso1. Pins 12 and 13 of chip U35 are connected in series with fuses F3 and F4 respectively and then connected to an external RS485 terminal. Fuse F3 and F4 are model SMD0805-20. Pin 12 of chip U35 is connected to one end of resistor R116 and pin 1 of chip U36 respectively. Pin 13 of chip U35 is connected to one end of resistor R117 and pin 2 of chip U36 respectively. Pin 3 of chip U36 and the other end of resistor R117 are both connected to analog power supply GNDiso1. The other end of resistor R116 is connected to analog power supply 5Viso1. Pin 15 of chip U35 is connected to one end of capacitor C168 and connected to analog power supply GNDiso1. Pin 16 of chip U35 is connected to the other end of capacitor C168 and connected to analog power supply 5Viso1.
[0036] Working principle: Figure 8 In the circuit diagram, A1 is the reactive power analog quantity acquisition circuit, A2 is the signal processing circuit, A3 is the SVG communication circuit, A4 is the wind turbine communication circuit, B1 is the dedicated reactive power compensation device for the low-voltage side of the main transformer S11, B2 is the dedicated reactive power compensation device for the low-voltage side of the main transformer S12, C1 is the wind turbine generator on the low-voltage side of the box-type step-up transformer S21, and C2 is the wind turbine generator on the low-voltage side of the box-type step-up transformer S22. In practical applications, such as... Figure 9As shown, the offshore wind power loss reduction device of this utility model is deployed in the centralized control room of the booster station. The SVG is deployed on the low-voltage bus side of the offshore wind power main transformer, and the wind turbine is deployed on the low-voltage side of the offshore booster transformer. The reactive power analog acquisition circuit A1 collects the three-phase voltage and current of the offshore wind power outgoing line 11, the three-phase voltage and current of the wind turbine on the low-voltage side of the main transformer S11 (after landing) are collected on the bus 21, the three-phase voltage and current of the dedicated reactive power compensation device on the low-voltage side of the main transformer S11 are connected to the bus 22, and the three-phase voltage and current of the dedicated reactive power compensation device on the low-voltage side of the main transformer S12 are connected to the bus 23. The three-phase voltage and current of the bus after the generator unit converges to the ground, the three-phase voltage and current of the low-voltage side wind turbine of the main transformer S11 before the ground convergence, and the three-phase voltage and current of the low-voltage side wind turbine of the main transformer S12 before the ground convergence are collected. The above-mentioned analog signals are input to the analog signal acquisition circuit through the filtering circuit. The analog signal acquisition circuit converts the reactive power analog quantity into a digital quantity and inputs it to the signal processing circuit. The signal processing circuit calculates and outputs the reactive power demand based on the reactive power analog quantity. In the signal processing circuit, simple addition and subtraction operations are performed. For example, the reactive power loss of the main transformer QS1 is the reactive power Q of the low-voltage side of the main transformer S11. 21. The reactive power Q22 on the low-voltage side of main transformer S11, Q23 on the low-voltage side of main transformer S12, and Q24 on the low-voltage side of main transformer S12, minus the reactive power Q11 of the outgoing line, the reactive power loss QS11_S21 of the submarine cable between main transformer S11 and transformer S21 is the reactive power Q31 on the high-voltage side of transformer S21 minus the reactive power Q21 on the low-voltage side of main transformer S11, and the reactive power loss QS12_S22 of the submarine cable between main transformer S12 and transformer S22 is the reactive power Q32 on the high-voltage side of transformer S22 minus the reactive power Q24 on the low-voltage side of main transformer S12. The signal processing circuit sends the signal to main transformer S11. 11. The reactive power remote adjustment QB1 of the low-voltage side dedicated reactive power compensation device B1 is half of QS1 plus half of QS11_S21. The signal processing circuit sends it to the main transformer S12. The reactive power remote adjustment QB2 of the low-voltage side dedicated reactive power compensation device B2 is half of QS1 plus half of QS12_S22. The signal processing circuit sends it to the box-type step-up transformer S21. The reactive power remote adjustment QC1 of the low-voltage side wind turbine C1 is half of QS11_S21. The signal processing circuit sends it to the box-type step-up transformer S22. The reactive power remote adjustment QC1 of the low-voltage side wind turbine C2 is half of QS12_S22.
[0037] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this 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 of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.
Claims
1. A device for reducing losses in offshore wind power, characterized in that: The device includes a reactive power analog quantity acquisition circuit, a signal processing circuit, a wind turbine communication circuit, and an SVG communication circuit. The reactive power analog quantity acquisition circuit includes multiple filtering circuits and multiple analog quantity acquisition circuits. The input terminal of the filtering circuit is connected to the reactive power analog quantity, and the output terminal of the filtering circuit is connected to the input terminal of the analog quantity acquisition circuit. The output terminal of the analog quantity acquisition circuit is connected to the input terminal of the signal processing circuit. The output terminal of the signal processing circuit is connected to the input terminal of the wind turbine communication circuit and the input terminal of the SVG communication circuit, respectively. The output terminal of the wind turbine communication circuit is connected to the wind turbine, and the output terminal of the SVG communication circuit is connected to the SVG.
2. The offshore wind power loss reduction device according to claim 1, characterized in that: The reactive power analog quantities include the three-phase voltage of the outgoing lines, the three-phase current of the outgoing lines, the three-phase voltage of the low-voltage side of the main transformer, the three-phase current of the low-voltage side of the main transformer, the three-phase voltage of the high-voltage side bus of the transformer substation, and the three-phase current of the high-voltage side bus of the transformer substation.
3. The offshore wind power loss reduction device according to claim 1, characterized in that: The filter circuit includes resistor RR7, resistor RR8, and capacitor CC4. One end of resistor RR8 is connected to the line where the acquisition point is located. The other end of resistor RR8 is connected to the input terminal of the analog acquisition circuit and one end of capacitor CC4. The other end of capacitor CC4 is connected to the input terminal of the analog acquisition circuit and one end of resistor RR7. The other end of resistor RR7 is grounded.
4. The offshore wind power loss reduction device according to claim 1, characterized in that: The analog signal acquisition circuit includes chip U15, resistors R27, R30, R35-R37, R44, R45, capacitors C52, C56, C60, C61, C72, C75, C77, C88, and C92. The first pin of chip U15 is connected to one end of capacitor C56 and the analog power supply AVCC. The other end of capacitor C56 is grounded. The second, forty-seventh, and twenty-sixth pins of chip U15 are connected together and then grounded. The thirty-eighth pin of chip U15 is connected to one end of capacitor C61 and the analog power supply AVCC. The other end is grounded. Pin 48 of chip U15 is connected to one end of capacitor C52 and analog power supply AVCC, with the other end of capacitor C52 grounded. Pin 37 of chip U15 is connected to one end of capacitor C60 and analog power supply AVCC, with the other end of capacitor C60 grounded. Pin 23 of chip U15 is connected to one end of capacitor C68 and analog power supply AVCC, with the other end of capacitor C68 grounded. Pin 3 of chip U15 is connected to ground in series with resistor R37. Pin 4 of chip U15 is connected to ground in series with resistor R36. Pin 5 of chip U15 is connected to ground in series with resistor R35. Pin 7 is connected in series with resistor R45 and then connected to a 3.3V voltage. Pin 34 of chip U15 is connected in series with resistor R44 and then grounded. Pin 43 of chip U15 is connected to one end of capacitor C88 and then grounded. Pin 42 of chip U15 is connected to the other end of capacitor C88 and then connected to the reference power supply VREF. Pins 44 and 45 of chip U15 are connected to one end of capacitor C92. Pin 46 of chip U15 is connected to the other end of capacitor C92 and then grounded. Pin 6 of chip U15 is connected in series with resistor R30 and then grounded. Pin 8 of chip U15 is connected in series with resistor R27 and then grounded. Pin 35 of chip U15... Pins 40, 41, and 42 are connected to ground. Pin 36 of chip U15 is connected to one end of capacitor C76 and one end of capacitor C77. The other end of capacitor C76 is connected to the other end of capacitor C77 and then grounded. Pin 39 of chip U15 is connected to one end of capacitor C72 and one end of capacitor C75. The other end of capacitor C72 is connected to the other end of capacitor C75 and then grounded. Pins 49 to 64 of chip U15 form eight signal channels for reactive power analog quantities. Each signal channel is connected to the output of the filter circuit. Pins 16 to 33 of chip U15 are all connected to the signal processing circuit.
5. The offshore wind power loss reduction device according to claim 4, characterized in that: The signal processing circuit includes a main control chip U3, resistors R6, R90, R11, R10, R9, and capacitors C24-C30. Pin 9 of the main control chip U3 is connected in series with resistor R6 and then connected to a crystal oscillator. Pin 173 of the main control chip U3 is connected in series with resistor R90 and then connected to a 3.3V voltage. Pin 171 of the main control chip U3 is connected in series with resistor R11 and then connected to a 3.3V voltage. Pin 37 of the main control chip U3 is connected to one end of capacitor C26 and one end of capacitor C27 and then grounded. Pin 39 of the main control chip U3 is connected to the other end of capacitor C26 and the other end of capacitor C27 and then connected to a 3.3V voltage. Pin 125 of the main control chip U3 is connected in series with capacitor C25 and then grounded. Pin 81 of the main control chip U3 is connected in series with capacitor C24 and then grounded. Pin 38 of the main control chip U3 is connected to one end of capacitor C28 and one end of capacitor C29 and then connected to a 3.3V voltage. The other end of capacitor C28 is connected to capacitor C30. The other end of 29 is connected to ground. The sixth pin of the main control chip U3 is connected to the capacitor C30 in series and then grounded. The forty-eighth pin of the main control chip U3 is connected to the resistor R9 in series and then grounded. The 166th pin of the main control chip U3 is connected to the resistor R10 in series and then grounded. The thirty-third, forty-second, fifty-third, fifty-fourth, fifty-fifth, eightieth, one hundred and forty-fourth, one hundred and fifty-sixth, and one hundred and fifty-seventh pins of the main control chip U3 are all connected to the wind turbine communication circuit. The forty-first pin of the main control chip U3 is connected to the wind turbine communication circuit in series with the resistor R70. The 104th, 105th, 142nd, 143rd, sixty-eighth to seventy-eighth, and ninety-sixth to ninety-eighth pins of the main control chip U3 are connected to the sixteenth to thirty-third pins of the chip U15 in sequence. The ninety-second, ninety-third, and ninety-fourth pins of the main control chip U3 are all connected to the SVG communication circuit.
6. The offshore wind power loss reduction device according to claim 5, characterized in that: The wind turbine communication circuit includes chips U21, U22, and U28, resistors R64-R81, capacitors C115-C123, and capacitor C127. Pins 13, 16, 17, and 18 of chip U21 are connected to pins 33, 80, 156, and 157 of the main control chip U3, respectively. Pin 8 of chip U21 is connected to pin 54 of the main control chip U3 and one end of resistor R67, with the other end of resistor R67 connected to 3.3V. Pin 7 of chip U21 is connected to pin 55 of the main control chip U3 and one end of resistor R68, with the other end of resistor R68 connected to 3.3V. Pin 10 of chip U21 is connected to resistor R68. Resistor R64 is connected in series and then grounded. Pin 11 of chip U21 is connected to pin 53 of main control chip U3 and one end of resistor R69. The other end of resistor R69 is connected to 3.3V. Pin 12 of chip U21 is connected in series with resistor R66 and then connected to 3.3V. Pin 15 of chip U21 is connected in series with resistor R65 and then connected to 3.3V. Pin 14 of chip U21 is connected in series with resistor R70 and then connected to pin 41 of main control chip U3. Pin 25 of chip U21 is connected to one end of capacitor C115, one end of capacitor C116, and one end of capacitor C117 and then grounded. The other ends of capacitors C115 and C116 are connected to pin 6 of chip U21. Pin 9 of chip U21 is connected to the other end of capacitor C117 and connected in parallel with a 3.3V voltage. Pin 1 of chip U21 is connected to pin 19 and then to one end of capacitor C118 and one end of capacitor C119, connected in parallel with a 3.3V voltage. The other end of capacitor C118 and the other end of capacitor C119 are connected to ground. Pin 24 of chip U21 is connected in series with resistor R71 and then to ground. Pin 2 of chip U21 is connected in series with resistor R72 and then to ground. Pin 3 of chip U21 is connected in series with resistor R73 and then to ground. Pin 1 of chip U22 is connected to pin 21 of chip U21 and one end of resistor R74. Pin 2 of chip U22 is connected to one end of capacitor C122 and connected in parallel with a 3.3V voltage. The other end of capacitor C122... The third pin of chip U22 is connected to the twentieth pin of chip U21 and one end of resistor R75. The other ends of resistor R74 and R75 are connected to one end of capacitor C120 and connected to a 3.3V voltage. The other end of capacitor C120 is grounded. The sixth pin of chip U22 is connected to the twenty-third pin of chip U21 and one end of resistor R77. The seventh pin of chip U22 is connected to one end of capacitor C123 and connected to a 3.3V voltage. The other end of capacitor C123 is grounded. The eighth pin of chip U22 is connected to the twenty-second pin of chip U21 and one end of resistor R76. The other ends of resistor R76 and R77 are connected to one end of capacitor C121 and connected to a 3.3V voltage.With a 3V voltage, the other end of capacitor C121 is grounded. Pin 9 of chip U22 is connected to pin 6 of chip U28. Pin 10 of chip U22 is connected to one end of resistor R78. Pin 15 of chip U22 is connected to one end of resistor R79. The other ends of resistors R78 and R79 are connected together and then connected to one end of resistors R80 and R81 respectively, and then to one end of capacitor C127. The other end of capacitor C127 is grounded. Pin 11 of chip U22 is connected to pin 3 of chip U28. Pins 4 and 5 of chip U28 are connected and then connected to the other end of resistor R80. Pins 7 and 8 of chip U28 are connected and then connected to the other end of resistor R81. Pin 14 of chip U22 is connected to pin 2 of chip U28. Pin 16 of chip U22 is connected to pin 1 of chip U28. Pins 9 and 10 of chip U28 are connected and then grounded.
7. The offshore wind power loss reduction device according to claim 5, characterized in that: The SVG communication circuit includes chip U35, chip U36, resistors R101, R116, and R117, capacitors C166 and C168. The first pin of chip U35 is connected to one end of capacitor C166 and then connected to a 3.3V voltage. The second pin of chip U35 is connected to the other end of capacitor C166 and then grounded. The third pin of chip U35 is connected to the 93rd pin of the main control chip U3 and one end of resistor R101, with the other end of resistor R101 connected to a 3.3V voltage. The fourth and fifth pins of chip U35 are connected to the 94th pin of the main control chip U3. The sixth pin of chip U35 is connected to the 92nd pin of the main control chip U3. The seventh and eighth pins of chip U35 are connected to grounded. The ninth pin of chip U35 is connected to… The analog power supply GNDiso1 is connected to the external RS485 terminal via the 12th and 13th pins of chip U35, which are connected in series with fuses F3 and F4 respectively. Fuse F3 and the 12th pin of chip U35 are connected to one end of resistor R116 and the first pin of chip U36 respectively. The 13th pin of chip U35 is connected to one end of resistor R117 and the second pin of chip U36 respectively. The third pin of chip U36 and the other end of resistor R117 are both connected to the analog power supply GNDiso1. The other end of resistor R116 is connected to the analog power supply 5Viso1. The 15th pin of chip U35 is connected to one end of capacitor C168 and connected to the analog power supply GNDiso1. The 16th pin of chip U35 is connected to the other end of capacitor C168 and connected to the analog power supply 5Viso1.
8. The offshore wind power loss reduction device according to claim 5, characterized in that: The chip U15 is model AD7606BSTZ, and the main control chip U3 is model STM32F767IGT6.
9. The offshore wind power loss reduction device according to claim 6, characterized in that: The model number of chip U21 is LAN8720A, the model number of chip U22 is H1102NL, and the model number of chip U28 is MJ5985-BX11-RB1.
10. The offshore wind power loss reduction device according to claim 7, characterized in that: The model number of chip U35 is ISO3082DW, and the model number of chip U36 is PSM712-LF-T7.