Abstract
Distribution STATic synchronous COMpensator (DSTATCOM) has been proved an effective approach to compensate reactive and harmonic current in distribution network. However, DC-link voltages of H-bridge cascaded DSTATCOM contain 100Hz (double grid frequency) voltage harmonics due to reactive compensation current, these harmonics will also exist in the output of DC-link voltage balancing controller which could ultimately cause low frequency harmonics in compensation current. As a result, compensation precision will be deteriorated, especially when harmonic voltage ripples are fairly high because of large compensation current or small DC-link capacitance. This paper proposes a harmonic elimination approach to DC-link voltage balancing control based on moving average filters (MAFs) for cascaded DSTATCOM, MAFs are used to eliminate the 100Hz harmonic components from the detected DC-link voltages. Finally, simulation and experimental results from H-bridge cascaded DSTATCOM show that better compensation performance can be obtained under both inductive and capacitive operation, thus verify the feasibility of the proposed technique.
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