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The HVDC power transmission system will be fallen into islanding operation mode under the following condition, the AC system at the sending end of the HVDC transmission system is disconnected from the main power grid due to the fault at transmission line. In the circumstance, the disturbances in AC/DC system can easily lead to the instability of frequency or voltage. For improving the frequency stability...
In the traditional controller design, local signal is only chosen to be the feedback variable, and improvement of single performance in the system is considered. This way to design controller could make uncertain affect to other performance in the system. A comprehensive performance index is used in the coordinated control theory, and the controller which is more coordinated is designed. By using...
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