Abstract
With the development of renewable energy (i.e. wind power and solar power) generation, its integration to the power grid has becoming a more and more important challenge. High voltage direct current (HVDC) transmission [1-2] is a suitable scheme for the integration. The key unit of HVDC is the converter. In general, there are two types of converters classified by the electronic devices. The one is named the current source converter (CSC) based on thyristors. The other one is named the voltage source converter (VSC) [3-4] based on insulated-gate bipolar transistors (IGBTs). The disadvantages of CSC are the probability of commutation failure, large harmonics, and inflexibility of power control. The advantages of CSC are high withstanding voltages and few losses. On the contrary, VSC has few harmonics and excellent output, but it has lower withstanding voltages and higher losses. And VSC cannot deal with direct current failure. To combine advantages of both topologies, an improved hybrid multilevel converter (HMC) is presented in this paper.
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