Control of series connected VSC modules for UHVDC application

As HVDC based on voltage source converter (VSC) technology has already reached 350 kVdc voltage level, this paper examines the feasibility of connecting four voltage source converter (VSC) modules, each rated at 200 kVdc, in series to form a pole of UHVDC rated at 800 kVdc. Due to the series connection layouts, the individual DC bus voltage inequality exists when power reversal occurs. A detailed control solution with DC voltage compensation equalizer for the series connected VSC-UHVDC system is developed and presented. The operation feasibility of the proposed UHVDC system is verified via simulation studies under different conditions such as active power step changes, reactive power step changes, and power reversal.

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