研究目的
To analyze the impact of the Distributed Static Series Compensator (DSSC) on the performance of distance relay protection in high voltage transmission lines under various fault conditions and locations.
研究成果
The presence of DSSC in transmission lines alters the apparent impedance calculated by distance relays during faults, leading to incorrect fault location estimates (overreach or underreach). This necessitates designing control algorithms for DSSC inverters to mitigate adverse effects and ensure accurate distance relay performance in HV transmission systems with DSSC.
研究不足
The study is based on simulation using MATLAB/SIMULINK, which may not fully capture real-world complexities. Only single phase-to-ground faults with zero resistance are considered; other fault types and resistances are not analyzed. The DSSC control algorithms are not optimized for accurate fault location estimation in this initial study.
1：Experimental Design and Method Selection:
The study uses MATLAB/SIMULINK software to simulate an IEEE 5 bus test system with DSSC and distance relay. The Mho relay characteristics are employed for fault detection.
2：Sample Selection and Data Sources:
The test system includes two equivalent sources and five buses, with a 100 km transmission line between buses 2 and
3：DSSCs are distributed equally along this line. List of Experimental Equipment and Materials:
The simulation utilizes MATLAB/SIMULINK software (version not specified, but referenced from 2009 manual). DSSC modules include low-power single-phase inverters, single winding transformers, power supply units, and communication circuits, using IGBTs, LC filters, and DC capacitors.
4：Experimental Procedures and Operational Workflow:
Single line-to-ground faults with zero fault resistance are simulated at various locations (e.g., 25%, 50%, 75% of the line length). Voltage and current are measured at the relay point to calculate apparent impedance.
5：Data Analysis Methods:
The apparent impedance is calculated and compared with and without DSSC inclusion. Results are tabulated to show changes in impedance and fault location estimates.
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