Wind power frequency conversion driving signal optimization method

Abstract

According to the wind power frequency conversion driving signal optimization method provided by the invention, a driving signal at the front end of an FS450R17KE3 type IGBT (Insulated Gate Bipolar Translator) is improved from 5V difference to 15V single end, so that the anti-interference capability of the driving signal is stronger, signal isolation, logic correction and driving enhancement processing are optimized, and the signal driving reliability is improved, so that the stable operation of a frequency converter power module is guaranteed, and the service life of the frequency converter power module is prolonged. The equipment failure rate is reduced. Setting an adapter plate connected with the main control board, and receiving a differential driving signal output by the main control board; in the adapter plate, the differential driving signal is converted into a single-end driving signal with a higher voltage amplitude; transmitting the converted single-ended driving signal to a driving board through a transmission line; in the driving board, isolation, logic correction and push-pull output are sequentially carried out on the received single-end driving signal, and a final driving signal used for controlling the IGBT is generated.

Description

Technical Field

[0001] This invention belongs to the field of new energy power generation and relates to wind power signal drive technology, specifically a wind power frequency conversion drive signal optimization method. Background Technology

[0002] The ABB ACS800-67 / 77 series wind power frequency converters are high-performance industrial automation frequency converters capable of precisely controlling motor speed and torque. The internal AINT-14C control board, as the main control component for signal input and output, can acquire analog quantities such as voltage and current, output PWM signals to drive IGBTs, process digital switching inputs, and implement relay outputs. The internal AGDR-71C driver board, as the core component of the drive power section, works in conjunction with Infineon's FS450R17KE3 IGBT module to reliably and stably convert DC to AC power.

[0003] refer to Figure 1 This section explains the drive connection between the AINT-14C control board and the AGDR-71C drive board of the original ABB ACS800-67 / 77 series wind power frequency converter. For example... Figure 1 As shown, the drive signal between the AINT-14C control board and the AGDR-71C driver board is a 5V differential drive signal, which is transmitted from the main control board to the driver board through a long transmission line. Because the 5V differential drive signal is easily interfered with during transmission over a long line, interference can easily cause the IGBT to explode and be damaged during operation.

[0004] refer to Figure 2 and Figure 3 This document provides a detailed explanation of the IGBT drive logic and interference-induced damage causes of the original ABB ACS800-67 / 77 series wind power frequency converters. The AINT-14C control board outputs a 5V differential drive signal, which requires transmission to the AGDR-71C drive board via a long cable. Figure 2 As shown, after the 5V differential drive signal is transmitted to the driver board, it first passes through a 74HC125 buffer chip to enhance the drive capability. When the input is low, the 74HC125 chip outputs low; when the input is high, the 74HC125 chip outputs high due to the pull-up signal at the back end. (See attached image) Figure 3As shown, the drive signal enters the drive control circuit after being output from the 74HC125. When the positive input is high and the negative input is low, BC187 is not turned on, and the IGBT is driven. When the positive input is low and the negative input is high, BC187 is turned on, and the IGBT is turned off. When the 5V differential signal is interfered with, it can cause the positive and negative terminals of the 5V input drive signal to be high or low simultaneously. In this case, BC187 will turn on. If the IGBT is in the on state just before BC187 turns on, the GE junction capacitance of the IGBT will discharge through R39 when BC187 turns on, resulting in a certain delay in the IGBT turn-off. This situation can lead to the IGBT exploding and being damaged. Summary of the Invention

[0005] To address the potential IGBT failure issue during operation of ABB ACS800-67 / 77 series wind power inverters, this invention provides a wind power inverter drive signal optimization method. This method upgrades the drive signal at the front end of the FS450R17KE3 model IGBT from 5V differential to 15V single-ended, enhancing the drive signal's anti-interference capability. Furthermore, it optimizes signal isolation, logic correction, and drive enhancement processing, improving signal drive reliability and ensuring stable operation of the inverter's power module, thereby reducing equipment failure rates.

[0006] The technical solution adopted by this invention to solve its technical problem is as follows: A method for optimizing wind power inverter drive signals includes the following steps: setting up an adapter board connected to the main control board to receive differential drive signals output by the main control board; converting the differential drive signals into single-ended drive signals with higher voltage amplitudes in the adapter board; transmitting the converted single-ended drive signals to the drive board via a transmission line; and sequentially isolating, logically correcting, and push-pull outputting the received single-ended drive signals in the drive board to generate the final drive signal for controlling the IGBTs.

[0007] Furthermore, the adapter board is implemented through an optocoupler conversion circuit. Before conversion, the differential drive signal is a 5V differential signal, and after conversion, the single-ended drive signal is a 15V single-ended drive signal.

[0008] Furthermore, the optocoupler conversion circuit uses an HCPL-2232 optocoupler. The first input channel of the HCPL-2232 optocoupler is connected to the positive and negative terminals of the upper bridge 5V drive signal through a current-limiting resistor, and the second input channel is connected to the positive and negative terminals of the lower bridge 5V drive signal through a current-limiting resistor. The first output channel of the HCPL-2232 optocoupler outputs a 15V upper bridge drive signal, and the second output channel outputs a 15V lower bridge drive signal. The logic relationship is as follows: when the LED of the input channel is turned on, the corresponding output channel outputs a high level; when the LED is turned off, it outputs a low level. The output signal has the same logic as the front-end input drive signal.

[0009] Furthermore, the driver board integrates an HCPL-2631 optocoupler, a TC4426EOA logic inverter chip, and an ACNT-H313 optocoupler connected in sequence.

[0010] Furthermore, the anode of the first input channel of the HCPL-2631 optocoupler is connected to the upper bridge 15V single-ended drive signal output by the adapter board via a current-limiting resistor, and its cathode is grounded; the anode of the second input channel is connected to the lower bridge 15V single-ended drive signal output by the adapter board via a current-limiting resistor, and its cathode is grounded; the output channel of the HCPL-2631 optocoupler outputs a 5V single-ended signal; its logic relationship is as follows: when the LED of the input channel is turned on, the corresponding output channel outputs a low level; when the LED is turned off, it outputs a high level.

[0011] Furthermore, the first output channel of the HCPL-2631 optocoupler is connected to the input of a TC4426EOA logic inverter chip, and the second output channel of the HCPL-2631 optocoupler is connected to the input of another TC4426EOA logic inverter chip to realize the logic inversion of the drive signal and the level conversion from 5V to 15V.

[0012] Furthermore, the upper bridge drive signal and the lower bridge drive signal at the output of the TC4426EOA logic inverter chip respectively drive a group of multiple ACNT-H313 optocouplers connected in parallel. The outputs of the multiple ACNT-H313 optocouplers are output to the adapter board and IGBT through a push-pull circuit.

[0013] Furthermore, the upper bridge drive signal and the lower bridge drive signal from the output terminal of the ACNT-H313 optocoupler are connected to the gate (G) of the IGBT through a drive resistor, and the emitter (E) of the IGBT is connected to the ground of the drive power supply.

[0014] This application also protects the application of the above-described wind power inverter drive signal optimization method in ABB ACS800-67 / 77 series wind power inverters.

[0015] The beneficial effects of this invention include: By adding an adapter board to convert the drive signal from 5V differential to 15V single-ended, the anti-interference capability of the signal during long-distance transmission can be improved. The HCPL-2232 optocoupler in the adapter board isolates and performs logic conversion of the differential signal, enabling safe signal transmission and level enhancement without changing the control logic. By sequentially placing HCPL-2631 optocouplers, TC4426EOA logic inverting chips, and ACNT-H313 optocouplers in the driver board, step-by-step signal isolation, logic correction, and drive enhancement can be achieved. In particular, the use of multiple ACNT-H313 optocouplers in parallel combined with push-pull output significantly enhances the load capacity and response speed of the final drive signal, ensuring fast and reliable IGBT switching. Finally, the drive resistor connected to the IGBT gate and properly grounded optimizes the drive circuit and suppresses voltage spikes. This method fundamentally solves the problem of IGBT false triggering and engine failure caused by signal interference in the original drive scheme, improving the stability and reliability of wind power inverter operation and extending the service life of core power devices. Attached Figure Description

[0016] Figure 1 Here is a connection diagram of the existing ABB main control board and driver board; Figure 2 The schematic diagram of the 74HC125 buffer on the existing AGDR-71C driver board; Figure 3 The schematic diagram of the existing AGDR-71C driver board drive control circuit; Figure 4 This is a block diagram showing the connection between the improved main control board and the driver board of the present invention; Figure 5 This is the circuit schematic diagram of the HCPL-2232 of this invention; Figure 6 The circuit schematics for HCPL-2631 and TC4426EOA of this invention are shown below. Figure 7 This is the circuit schematic diagram of the ACNT-H313 of this invention; Figure 8 This is a schematic diagram of the GE circuit connected to the driving resistor in this invention. Detailed Implementation

[0017] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0019] To optimize the drive signals of ABB series wind power inverters, refer to Figure 4 This invention eliminates the use of the original AGDR-71C driver board in the unit, replacing it with an improved adapter board, driver board, and matching board. The advantages of this improved ABB drive signal are as follows: An adapter board is added at the top, adjacent to the main control board. The IGBT drive signal output by the main control board remains a 5V differential signal; the adapter board converts this 5V differential drive signal into a 15V single-ended drive signal. The 15V single-ended drive signal output by the adapter board is connected to the driver board via a long transmission line. The driver board processes the 15V single-ended drive signal to drive the IGBTs. The drive signal transmitted on the long transmission line between the adapter board and the driver board is a 15V single-ended signal, providing strong anti-interference capabilities, ensuring normal IGBT drive and reducing damage from system crashes.

[0020] Example 1: The present invention mainly consists of two parts: an adapter board and a driver board.

[0021] refer to Figure 5 This is the schematic diagram of the HCPL-2232 optocoupler circuit used to convert the 5V differential signal on the adapter board into a 15V single-ended drive signal. The positive terminal of input pin 1 of the HCPL-2232 optocoupler is connected to the positive terminal of the upper bridge 5V drive signal through a current-limiting resistor, and the negative terminal of input pin 1 is also connected to the negative terminal of the upper bridge 5V drive signal through a current-limiting resistor. The positive terminal of input pin 2 is connected to the positive terminal of the lower bridge 5V drive signal through a current-limiting resistor, and the negative terminal of input pin 2 is also connected to the negative terminal of the lower bridge 5V drive signal through a current-limiting resistor. Output pin 1 outputs the 15V upper bridge drive signal, and output pin 2 outputs the 15V lower bridge drive signal. The HCPL-2232 optocoupler chip operates on the principle that the output is high when the input diode is conducting and low when the diode is not conducting, following the same logic as the front-end input drive signal.

[0022] Figure 6 , Figure 7 and Figure 8 This is a circuit schematic for processing 15V single-ended drive signals on the driver board.

[0023] (1) Figure 6The positive terminal of input pin 1 of the HCPL-2631 optocoupler is connected to output pin 1 of the HCPL-2232 optocoupler on the main adapter board via a current-limiting resistor, which is the 15V upper bridge drive signal. The negative terminal of input pin 1 of the HCPL-2631 optocoupler is grounded. The positive terminal of input pin 2 of the HCPL-2631 optocoupler is connected to output pin 2 of the HCPL-2232 optocoupler on the main adapter board via a current-limiting resistor, which is the 15V lower bridge drive signal. The negative terminal of input pin 2 of the HCPL-2631 optocoupler is grounded. The output of the HCPL-2631 optocoupler is a 5V single-ended signal. The logic is that the output is low when the input diode is conducting and high when the diode is not conducting, which is the opposite logic of the front-end input drive signal. To solve this problem, a TC4426EOA logic inverter chip is connected to invert the drive signal logic and convert 5V to 15V. The output pin 1 of the HCPL-2631 optocoupler is connected to the input of one TC4426EOA, and the output pin 2 of the HCPL-2631 optocoupler is connected to the input of another TC4426EOA.

[0024] (2) Figure 7 The upper bridge drive signal at the output of the TC4426EOA drives a group of three ACNT-H313 optocouplers connected in parallel. The outputs of the three ACNT-H313 optocouplers are output to the adapter board and IGBT through a push-pull circuit. The lower bridge drive signal at the output of the TC4426EOA is the same as the upper bridge drive signal.

[0025] (3) Figure 8 The positive and negative drive signals from the upper / lower bridge of the ACNT-H313 optocoupler are connected to the gate (G) of the IGBT through a drive resistor, and the emitter (E) of the IGBT is connected to the ground of the drive power supply.

[0026] In summary, the improved replacement of this invention includes two parts: adding an adapter board and replacing the AGDR-71C driver board. It can replace the AGDR-71C driver board in the existing ABB ACS800-67 / 77 series wind power frequency converters to drive the FS450R17KE3IGBT. This improvement by upgrading the driver type at the front end of the driver board from 5V differential to 15V single-ended can reduce the impact of interference on the drive signal and ensure that the IGBT can operate reliably and stably.

[0027] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A method for optimizing wind power inverter drive signals, characterized by the following steps: An adapter board connected to the main control board is set up to receive the differential drive signal output by the main control board. In the adapter board, the differential drive signal is converted into a single-ended drive signal with a higher voltage amplitude. The converted single-ended drive signal is transmitted to the driver board through a transmission line. In the driver board, the received single-ended drive signal is isolated, logically corrected, and pushed-pull output sequentially to generate the final drive signal for controlling the IGBT.

2. The wind power inverter drive signal optimization method according to claim 1, characterized in that, The adapter board is implemented through an optocoupler conversion circuit. Before conversion, the differential drive signal is a 5V differential signal, and after conversion, the single-ended drive signal is a 15V single-ended drive signal.

3. The wind power frequency converter drive signal optimization method according to claim 2, characterized in that, The optocoupler conversion circuit uses an HCPL-2232 optocoupler. The first input channel of the HCPL-2232 optocoupler is connected to the positive and negative terminals of the upper bridge 5V drive signal through a current-limiting resistor, and the second input channel is connected to the positive and negative terminals of the lower bridge 5V drive signal through a current-limiting resistor. The first output channel of the HCPL-2232 optocoupler outputs a 15V upper bridge drive signal, and the second output channel outputs a 15V lower bridge drive signal. The logic relationship is as follows: when the LED of the input channel is turned on, the corresponding output channel outputs a high level; when the LED is turned off, it outputs a low level. The output signal has the same logic as the front-end input drive signal.

4. The wind power frequency converter drive signal optimization method according to claim 2, characterized in that, The driver board integrates an HCPL-2631 optocoupler, a TC4426EOA logic inverter chip, and an ACNT-H313 optocoupler connected in sequence.

5. The wind power frequency converter drive signal optimization method according to claim 4, characterized in that, The first input channel of the HCPL-2631 optocoupler has its anode connected to the upper bridge 15V single-ended drive signal output from the adapter board via a current-limiting resistor, and its cathode grounded. The second input channel has its anode connected to the 15V single-ended drive signal output from the adapter board via a current-limiting resistor, and its cathode grounded. The output channel of the HCPL-2631 optocoupler outputs a 5V single-ended signal. Its logic is as follows: when the LED of the input channel is turned on, the corresponding output channel outputs a low level; when the LED is turned off, it outputs a high level.

6. The wind power frequency converter drive signal optimization method according to claim 5, characterized in that, The first output channel of the HCPL-2631 optocoupler is connected to the input of a TC4426EOA logic inverter chip, and the second output channel of the HCPL-2631 optocoupler is connected to the input of another TC4426EOA logic inverter chip to realize the logic inversion of the drive signal and the level conversion from 5V to 15V.

7. A wind power frequency converter drive signal optimization method according to claim 6, characterized in that, The upper bridge drive signal and lower bridge drive signal at the output of the TC4426EOA logic inverter chip drive a group of multiple ACNT-H313 optocouplers connected in parallel. The outputs of the multiple ACNT-H313 optocouplers are output to the adapter board and IGBT through a push-pull circuit.

8. A wind power frequency converter drive signal optimization method according to claim 6, characterized in that, The upper bridge drive signal and the lower bridge drive signal from the output terminal of the ACNT-H313 optocoupler are connected to the gate (G) of the IGBT through a drive resistor, and the emitter (E) of the IGBT is connected to the ground of the drive power supply.

9. The application of the wind power inverter drive signal optimization method as described in any one of claims 1-8 to the ABB ACS800-67 / 77 series wind power inverters.

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