Thermal Performance Improvement in Multi-Megawatt Power Converters Serving to Asynchronous Hydro Generators Operating Around Synchronous Speed
Thermal Performance Improvement in Multi-Megawatt Power Converters Serving to Asynchronous Hydro Generators Operating Around Synchronous Speed
复制标题
用于同步速度运行的异步水轮发电机的多兆瓦功率转换器的热性能改进
DOI：
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发表时间：
2021
影响因子：
4.9
通讯作者：
T. Chelliah
中科院分区：
文献类型：
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作者：
Karthik Desingu;R. Selvaraj;B. A. Kumar;T. Chelliah
在多兆瓦三电平中性点钳位背靠背功率变换(3L-NPC)中，功率半导体器件由于其热机械疲劳应力而被认为是最脆弱的元件。尤其是双馈电机转子侧变流器(RSC)在同步运行过程中会产生较大的热应力。它降低了功率转换器的性能，降低了驱动器的使用寿命。在实际应用中，稳定各个功率半导体器件的温度波动可以提高功率转换器的效率和可靠性。针对这一主要目标，本文提出了一种基于载波的有源热控制方法，用于调节250 MW异步水轮发电机组用多MW(5×5 MW)3L-NPC功率变流器中功率半导体器件的温度波动。为了验证所提出的主动热控制方法，在MatLab/PLECS环境下对印度特赫里抽水蓄能电站即将投产的一台250 MW DFIM水轮发电机组的不同运行工况进行了测试。所设计的主动热控制方法有效地将功率半导体器件的平均结温和温度波动控制在安全工作范围内。通过一台2.2kW的DFIM实验室样机，验证了所提出的主动热控制方法的可行性和适用性。
In multi-MW three-level neutral point clamped back-to-back (3L-NPC) power converters, power semiconductor devices are considered as most vulnerable components due to its thermo-mechanical fatigue stress. Particularly, rotor side converter (RSC) in doubly fed induction machine (DFIM) experiences high thermal stress during its operation around synchronous speed. It degrades the performance of power converter and reduces the lifetime availability of the drive. In practice, stabilization of temperature fluctuation across each power semiconductor device improves the efficiency and reliability of power converter. With respect to this prime aim, this paper proposes a carrier-based active thermal control method to regulate temperature fluctuation across power semiconductor devices in a multi-MW (5 x 5 MW) 3L-NPC power converters serving to a 250 MW asynchronous hydro-generating unit. To test the proposed active thermal control method, different operating conditions of a 250 MW DFIM hydro-generating unit (to be commissioned in Tehri pumped storage plant, India) are examined in MATLAB/PLECS environment. The designed active thermal control method effectively regulates mean junction temperature and temperature fluctuation of power semiconductor devices within a safe operating limit. The practical feasibility and adoptability of proposed active thermal control is examined through a 2.2-kW DFIM laboratory prototype.