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In modular multilevel converters (MMC), a circulating current in each phase unit is caused by the DC voltage ripples of the phase unit. This paper analyzed the power transfer of MMC, the energy and voltage fluctuations of the storage capacitors in the sub-modules. An accurate model to determine the voltage ripples of a phase unit is derived, in consideration of the asynchronous fluctuations of the...
In HVDC systems, power converters are well known the generators of harmonics on both ac and dc side. Because of the interaction between ac and dc systems, some kinds of disturbances in the ac or dc side may cause the fundamental or second harmonic current on the dc side. When the dc loop of the HVDC system has natural resonant frequencies on the fundamental or the second harmonic frequencies, the...
The thyristor controlled series capacitor (TCSC) is subsynchronous resonance (SSR) neutral in itself. But in a hybrid system which includes both conventional fixed series compensation and TCSC, disturbances may still excite torsional modes. This paper aims to design a supplementary damping controller for the hybrid system to mitigate the SSR. The method and procedure for the syntheses of the controller...
In this paper, the effects of different types of excitation systems and PSS on the SSR damping characteristics are studied. The complex torque coefficient approach realized by time domain simulation - the test signal method is adopted. The studied system consists of a single-machine infinite bus system. Three types of excitation systems - IEEE AC1A, AC2A, ST1A excitation systems are selected as examples...
In this paper, an integrated approach combining the calculation of electrical damping versus frequency and time domain simulation is applied in analyzing the SSR problem of Tuoketuo Power Plant caused by its series compensation transmission scheme. Firstly, the electrical damping versus frequency in different series compensation degrees and different operating conditions is calculated using the test...
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