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Abstract
Accurate detection and effective control strategy of commutation failure (CF) of high voltage direct current (HVDC) are of great significance for keeping the safe and stable operations of the hybrid power grid. At first, a novel detection method for consecutive CF is proposed. Concretely, the 2nd and higher orders’ derivative values of direct current are summarized as the core to judge CF by analyzing the physical characteristics of the direct current waveform of the converter station in CF. Then, the Daubechies wavelet coefficient that can represent the 2nd and higher order derivative values of direct current is derived. Once the wavelet coefficients of the sampling points are detected to exceed the threshold, the occurrence of CF is confirmed. Furthermore, by instantly increasing advanced firing angle β in the inverter side, an additional emergency control strategy to prevent subsequent CF is proposed. Eventually, with simulations of the benchmark model, the effectiveness and superiorities of the proposed detection method and additional control strategy in accuracy and rapidity are verified.
Highlights
Commutation failure (CF) is a common threat to high voltage direct current (HVDC)
Due to the application of thyristor, strong reactive support from an AC system is needed for guaranteeing the normal operation of HVDC
The proposed CF detection method is based on the direct current waveform, which is available for the converter station
Summary
Commutation failure (CF) is a common threat to high voltage direct current (HVDC). The drop of converter bus voltage caused by AC fault is the main reason for commutation failure of converter station, especially in the inverter side [1,2,3,4]. CF increases the direct current, resulting in converter transformer DC bias and inverter system over-voltage. To protect the valves from high current during CF, the valve lockout controller will lock them after detection of CF. As most AC faults are temporary and the restart of HVDC takes time and results in power imbalance, it is conservative to lock the valves after the occurrence of single CF [9]. It is more sensible to lock the valves after the occurrence of consecutive
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