The problems and the conditions of electromagnetic loop network operation in Hunan Power System are analyzed.

分析了电力系统电磁环网运行存在的问题，电磁环网运行必须具备的条件。

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The operation state of isolation monitor of loop power supply network is analyzed. Solutions have been proposed so as to assure safety and reliable operation of power system.

对环型供电直流系统的绝缘监测运行情况进行了分析，并提出了解决方案，以确保电力系统安全、可靠运行。

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And a new hybrid speed identification method is also proposed, which based on the neural network, combines the open loop estimator and the instantaneous reactive power model reference adaptive system.

介绍了异步电动机矢量控制系统神经网络速度控制器的设计方法；同时提出了将开环直接计算与模型参考自适应方法相结合的神经网络混合转速辨识模型。

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And a new hybrid speed identification method is also proposed, which based on the neural network, combines the open loop estimator and the instantaneous reactive power model reference adaptive system.

介绍了异步电动机矢量控制系统神经网络速度控制器的设计方法；同时提出了将开环直接计算与模型参考自适应方法相结合的神经网络混合转速辨识模型。

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