A method for suppressing junction temperature fluctuations of igbt devices in doubly-fed wind turbine generator-side converters
A doubly-fed wind turbine, fluctuation suppression technology, applied in motor control, motor generator control, electronic commutation motor control, etc., can solve problems such as large fluctuations in junction temperature, achieve reduced running time, low cost, and improved reliable operation sexual effect
Active Publication Date: 2017-12-15
重庆平创半导体研究院有限责任公司
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Problems solved by technology
However, for the problem of large fluctuations in the junction temperature of the unit-side converter of the doubly-fed wind turbine operating near the synchronous speed point, the existing method of suppressing the junction temperature fluctuation from the modulation strategy has no significant effect
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[0064] Taking a 2MW doubly-fed wind turbine as the research object, the proposed control strategy is verified by analyzing its dynamic crossing the synchronous speed region to suppress the IGBT junction temperature fluctuation of the machine-side converter of the doubly-fed wind turbine:
[0065] For converters with symmetrical topology, the equivalent foster thermal network of IGBTs and parallel diodes belonging to the same half-bridge is as follows: Figure 4 Shown. After obtaining the device operating loss, the calculation expression of the average value of the device junction temperature is as follows
[0066] T H =P tot R thHA +T a
[0067] T j_IGBT =P loss_IGBT ·(R thJC +R thCH )+T H
[0068] Where R thJC , R thCH , R thHA They are the thermal resistance of the device from junction to case, case to heat sink, and heat sink to the external environment; T a Represents the ambient temperature outside the converter; P tot Is the total loss of the internal components of the...
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The invention relates to an IGBT device junction temperature fluctuation inhibition method of a doubly-fed wind turbine generator system machine-side current transformer. The method comprises the following steps: a set slip ratio and stator active power are calculated by use of a doubly-fed generator rotating speed, a stator electric signal and a rotor electric signal; and through an additional control outer ring mode, a maximum power tracking control strategy based on power and a rotating speed double-control outer ring is constructed, based on the set slip ratio and the size of the stator active power, a set operation state is determined, and different control outer rings are selected for performing power and rotating speed control on a set, such that inhibition of junction temperature fluctuations of an IGBT device of the machine-side current transformer is finally realized. The method provided by the invention can be directly applied to a maximum power tracking control strategy generally adopted by a current wind turbine generator system through the additional control outer ring mode, can effectively reduce the junction temperature fluctuations of a conventional doubly-fed wind turbine generator system machine-side current transformer nearby a synchronization rotating speed point, and provides technical support for improving the operation reliability of the IGBT device and prolonging the service life of the IGBT device.
Description
Technical field [0001] The invention belongs to the technical field of thermal management of high-power power electronic devices for new energy generation, and relates to a method for suppressing junction temperature fluctuations of IGBT devices of a machine-side converter of a doubly-fed wind turbine. Background technique [0002] In recent years, doubly-fed wind turbines have become one of the main models of large-capacity wind farms in my country. As a key component in the electrical system of the unit, the converter has a high cost and is one of the electrical components with the highest frequency of failures. In particular, doubly-fed wind turbines run near the synchronous speed point. Due to the low output frequency of the generator-side converter, the increase Increasing the operating cycle of the IGBT device increases its junction temperature fluctuation, resulting in a large change in the alternating thermal stress, which can cause an irreversible impact on the device an...
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IPC IPC(8): H02P21/12
CPCH02P21/12H02P2205/07
Inventor 李辉李洋廖兴林胡姚刚宋二兵刘海涛赵杰肖洪伟
Owner 重庆平创半导体研究院有限责任公司