Abstract
A 21-level (line-to-line) self-commutated BTB (Back-To-Back) system based on series connection of sixteen converter cells has attractive features as follows: i) Both active and reactive powers can be controlled independently even in transient states. ii) The BTB system produces almost sinusoidal voltage at the ac side without performing PWM (Pulth-Width-Modulation) control, so that no harmonic filter is required. iii) The BTB system provides an active power response as high as 3ms. This paper presents experimental verifications of the self-commutated BTB system intended for achieving power flow control in transmission systems. Experimental results obtained by a 200-V, 20-kW laboratory prototype confirm effectiveness and validity of both the system configuration and the developed control strategy.
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