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Abstract: With the fast development of the photovoltaic (PV) industry, techniques of improving solar cell efficiency, reliable and low cost inverter and advanced fault detection methods have been introduced. This thesis is focusing on ground fault detection on the DC side of a PV system. Ground fault detection interrupter (GFDI) has been implemented in PV systems to detect ground faults and open t... read morehe circuit during fault operations. However, GFDI is only effective for low impedance ground fault. For high impedance ground fault (HIGF), GFDI will not be triggered since there is not enough fault current flowing through the device. HIGF should be cleared in a PV system; otherwise, potential hazards will induce fire accident of the PV generation plant and it will result in electrical shock of system operator. A common mode current detection method has been adopted in this thesis to distinguish normal operation and HIGF operation of PV systems. Common mode model of PV system is derived which combines stray capacitance of PV arrays and stray parameters of inverter and power transmission line. Normal operation and HIGF operation will display different characteristics at common mode resonant frequencies. PSIM simulation results validate the feasibility of our common mode current detection method.
Thesis (M.S.)--Tufts University, 2016.
Submitted to the Dept. of Electrical Engineering.
Advisor: Alex Stankovic.
Committee: Hanoch Lev-Ari, and Ronald Lasser.
Keyword: Electrical engineering.read less
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