Abstract
A delta-connected STATCOM with cascade multilevel full H-bridge (FHB) converter has been applied for phase balancing and power factor correction of unbalanced load in a three-phase, three-wire power distribution system. In this paper, a feedforward compensation formula is presented for the STATCOM by using the symmetrical components method to compensate unbalanced load. Computer simulation is performed for preliminary verification. Accordingly, a hardware prototype employing a TMS320F2812 DSP-based system is built for final verification test. Experimental results show that the proposed STATCOM is very effective for real-time unbalanced load compensation.
Highlights
A large unbalanced capacity load, such as a single-phase electrical railway system, in a three-phase, three-wire electric power distribution system can absorb undesired negative-sequence currents and reactive power
This paper introduces a very suitable transition of technology from existing static var compensators (SVCs) to new-generation STATCOM in high power application
Each arm of the STATCOM consists of three full H-bridge (FHB) cells and a reactor XST connected in series
Summary
A large unbalanced capacity load, such as a single-phase electrical railway system, in a three-phase, three-wire electric power distribution system can absorb undesired negative-sequence currents and reactive power. Cascade FHBs-based STATCOM can be connected as a delta configuration [22,23,24,25,26,27,28,29] This type of STATCOM is known as single delta bridge cells (SDBCs)-based STATCOM, which can compensate the negative-sequence current of unbalanced loads to achieve a balanced operation, and perform unity power factor correction. In each STATCOM arm, the high-voltage FHB cell uses step modulation and the low-voltage FHB uses 5 kHz pulse width modulation (PWM) technique at the same time This modulation technique can improve efficiency and output waveform, and compensate reactive power and negative-sequence currents. A delta-connected, transformerless STATCOM with cascade multilevel FHB converter and step modulation is introduced for real-time unbalanced load compensation in three-phase, three-wire distribution systems. This paper introduces a very suitable transition of technology from existing SVC to new-generation STATCOM in high power application
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