Abstract
This paper proposes a newly developed single-delta bridge-cell, modular multilevel cascade converter (SDBC-MMCC)-based distribution-level static synchronous compensator (DSTATCOM) for single-phase load compensation in three-phase, three-wire electric power distribution systems. Each main circuit arm of the DSTATCOM uses a modular multilevel cascade converter based on full-H-bridge (FHB) cells. The three main DSTATCOM arms are delta-connected to allow phase-independent operations for phase balancing and unity power factor correction of the single-phase load in three-phase, three-wire electric power distribution systems. By using the symmetrical components method, a feedforward compensation algorithm was employed for the DSTATCOM. A simulation of the DSTATCOM was performed for functioning verification. Finally, a hardware test system was built by using a multi-DSP-based control system. The test results verified the effectiveness of the proposed SDBC-MMCC-based DSTATCOM in single-phase load compensation.
Highlights
In a three-phase electric power distribution system, a large power capacity of single-phase load absorbs unbalanced load current and reactive power
Compared to traditional static var compensators (SVC), STATCOMs have suitable for unbalanced load compensations in modern three-phase electric power distribution quicker response times, more compact structures, wider compensation ranges, and smaller installation systems
The hardware experimental results verified that the proposed SDBC-MMCC-based DSTATCOM is suitable for real-time phase balancing and power factor correction of single-phase loads in three-phase, three-wire power distribution systems
Summary
In a three-phase electric power distribution system, a large power capacity of single-phase load (e.g., an electrical railway traction system) absorbs unbalanced (negative-sequence) load current and reactive power. Compared to traditional SVCs, STATCOMs have suitable for unbalanced load compensations in modern three-phase electric power distribution quicker response times, more compact structures, wider compensation ranges, and smaller installation systems. Due to lower voltage stress and modular structure, single-delta bridge-cell, modular multilevel highly suitable for unbalanced load compensations in modern three-phase electric power distribution cascade converters (SDBC-MMCCs) are very suitable for the main circuits of DSTATCOMs in highsystems. The SDBC-MMCC-based DSTATCOMs can replace the SVCs single-phase load compensation in a three-phase, three-wire power distribution system is proposed. Feedforward compensation algorithm derived from the symmetrical components method was Applications of multilevel full-H-bridge (FHB) converters and staircase modulation in the DSTATCOM designed for the DSTATCOM, which was constructed using the MATLAB/SimuLink program for main circuit can achieve high-efficiency operation in practical applications. In single-phase load compensation, the control algorithm of the DSTACOM is more compact, and the sizing of the DSTATCOM is more precisely defined
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