Test method for communication and response delay between main control PLC and converter

A test method and converter technology, applied in electrical testing/monitoring, testing/monitoring control systems, instruments, etc., can solve problems such as inability to accurately judge response delays

Inactive Publication Date: 2018-12-28
SHANGHAI ELECTRIC WIND POWER GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the actual operation of the wind turbine, the torque changes all the time, and after full power, the torque remains unchanged, so it is impossible to accurately judge its response delay

Method used

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  • Test method for communication and response delay between main control PLC and converter

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Embodiment Construction

[0016] as the picture shows, figure 1 It is a flow chart of the present invention, a test method for communication and response delay between the main control PLC and the converter, wherein, the wind turbine starts and enters the power generation mode; according to the wind condition, the power of the wind turbine is limited to the pitch angle of A set value, the fan is in the full power state under the limited power; the fan control mode is constant torque control; by giving a step signal to the converter, the fan is superimposed with an additional torque value; record the excitation of the step signal and feedback delay to obtain the communication and response delay of the converter.

[0017] Further, the PLC controls the converter through the communication module so that the fan control mode is constant torque control.

[0018] Further, the communication module includes a master control terminal communication module communicating with the PLC and a converter terminal commu...

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Abstract

The invention discloses a test method for communication and response delay between a master control PLC and a converter. A fan is started to enter a power generation mode; according to a wind condition, the power of the fan is limited until a pitch angle becomes a set value, and the fan is in a full state under a limited power; the fan control mode is a constant torque control; the fan is superimposed with an additional torque value by adding a step signal to the converter; recording the excitation and feedback delay of the step signal, and obtaining the communication and response delay of theconverter. According to the test method for communication and response delay between main control PLC and converter, when the torque of the fan is stable, the step torque signal is excited, and the converter communication and response delay are judged by testing the response delay of the converter to the step.

Description

technical field [0001] The invention relates to a testing method for a fan, in particular to a testing method for communication and response delay between a main control PLC and a converter. Background technique [0002] At present, the communication buses between the converter and the main control mainly include RS232 and PROFIBUS. At present, PROFIBUS is the majority. For the communication delay test of the PROFIBUS bus, the method mainly uses the combination of software and hardware. The tools mainly include: profiscript, NETTEST II etc. This type of product mainly captures communication messages by simulating the master station, and tests and analyzes the communication data at the protocol layer, with relatively comprehensive and powerful functions. [0003] For the relatively old wind turbines in the current market, it is necessary to improve the real-time performance and accuracy of the control, realize the upgrade of the main control control system, and combine the a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B23/02
CPCG05B23/0213G05B2219/24065
Inventor 冯胜东李缓
Owner SHANGHAI ELECTRIC WIND POWER GRP CO LTD
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