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Converter system and control method thereof

A technology of a converter system and a control method, which is applied in the field of converters and can solve problems such as wind turbine downtime due to failure

Active Publication Date: 2016-07-06
CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of this, the purpose of the present invention is to provide a converter system and its control method, which can solve the technical problem of wind turbine shutdown due to abnormal speed sensor signals, reduce the downtime of wind turbines before maintenance, and improve the sensor signal. System Stability During Abnormalities

Method used

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  • Converter system and control method thereof
  • Converter system and control method thereof
  • Converter system and control method thereof

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Embodiment 1

[0084] as attached figure 1 And attached Figure 4 As shown, a specific embodiment of a converter system includes: a converter, a motor 3, a speed sensor 5 and a control device 10. When the converter system is in normal operation, the control device 10 uses the rotor speed sampled by the speed sensor 5 The position signal controls the converter, and monitors the state of the speed sensor 5 in real time according to the rotor current error of the motor 3 . As a typical specific embodiment of the present invention, the motor 3 further adopts a doubly-fed motor. When the signal of the speed sensor 5 is abnormal, the control device 10 uses the estimated rotor position signal instead of the rotor position signal sampled by the speed sensor 5 to control the converter. The converter further includes a grid-side converter 1, a generator-side converter 2, and a crowbar circuit 4. The AC terminal of the grid-side converter 1 is connected to the grid 6 through a grid-side inductor 7, a...

Embodiment 2

[0088] A specific embodiment of a converter system control method, comprising the following steps:

[0089] S11: when the converter is running normally, the control device 10 uses the rotor position signal sampled by the speed sensor 5 to control the converter, and monitors the state of the speed sensor 5 in real time according to the rotor current error of the motor 3;

[0090] S12: When the signal of the speed sensor 5 is abnormal, the control device 10 uses the estimated rotor position signal instead of the rotor position signal sampled by the speed sensor 5 to control the converter.

[0091] as attached Figure 11 As shown, a more specific embodiment of the above-mentioned converter system control method includes the following steps:

[0092] S101: When the converter is running normally, the machine-side converter 2 is controlled using the rotor position signal and the rotor speed signal sampled by the speed sensor 5;

[0093] S102: the rotor position estimation unit of ...

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Abstract

The invention discloses a converter system and a control method thereof. The converter system comprises a converter, a motor, a speed sensor and a control device. When the converter system works normally, the control device controls the converter by employing a rotor position signal sampled by the speed sensor; and the state of the speed sensor is monitored in real time according a rotor current error of the motor. When the signal of the speed sensor is abnormal, the control device employs a rotor position estimation signal to replace the rotor position signal sampled by the speed sensor to control the converter. According to the invention, with the system and the control method, a technical problem that the converter system shuts down due to fault occurrence after abnormity of the speed sensor signal can be solved; the shutdown time of the converter system before maintenance can be reduced; and the system stability can be improved under the circumstance that the speed sensor signal is abnormal.

Description

technical field [0001] The invention relates to the field of converter technology, in particular to a system for improving the operating performance of a wind power converter when a speed sensor signal is abnormal and a control method thereof. Background technique [0002] Wind power is currently the fastest growing renewable energy utilization method with the most prospects for large-scale and commercial development. Double-fed power generation technology is more suitable for megawatt-level high-power variable-speed constant-frequency wind power generation, and occupies a very important position in wind power generation systems. For doubly-fed motor control, its control performance has a great dependence on the accurate detection of speed and rotor position. In the doubly-fed wind power system, the speed sensor is a type of component with a high failure rate. The electromagnetic conditions of the working environment of the speed sensor are relatively harsh, and the signal...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02P21/14H02P101/15
Inventor 张少云
Owner CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
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