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In this paper, the impact of large-scale penetration of distributed generation (DG) system in the presence of non-linear loads is addressed. The effect of different DG penetration levels on the grid side current harmonics is examined. It is found that current harmonics generated by downstream non-linear loads with a TDD (total demand distortion) that is compliant with IEEE Standards can lead to significantly high THD (total harmonic distortion) values at the grid side under certain loading scenarios. These low magnitude highly distorted currents may cause protection circuitry and grid-synchronizing circuitry malfunctioning, and may even cause a resonance condition with power factor correction capacitor on the network. This paper further presents a control application of Photovoltaic (PV) solar plant based DG inverter o mitigate the above harmonics problem. The increased harmonic level issue and the application of PV solar plant to mitigate such problem have been demonstrated both by MATLAB/ SIMULINK simulation studies and laboratory experimental results. [ABSTRACT FROM PUBLISHER]

This paper presents a new control of PV solar system as a STATCOM, termed PV-STATCOM, for faster post-fault voltage recovery, thereby avoiding the voltage instability of a neighboring critical induction motor load. Distributed Generators (DGs), such as PV solar systems, are typically required to disconnect upon detection of fault according to the current grid code of DG interconnection. Although, the preferred industry trend is to allow them to remain connected with Low Voltage Ride Through (LVRT) capabilities. In this paper, a case study is presented where an induction motor close to a PV solar system becomes unstable due to slow post fault voltage recovery. A fast fault detection control strategy is utilized in the PV solar system to disconnect the PV solar panels and convert the PV solar system inverter into a STATCOM, thereby providing rapid reactive power support to stabilize the voltage. This novel control strategy of utilizing the PV solar farm temporarily as a STATCOM after the fault prevents a critical induction motor from becoming unstable. [ABSTRACT FROM PUBLISHER]

This paper presents a Bibliography of FACTS technology for 2011. It provides a listing of various journal and conference papers in this area. This Bibliography includes papers published until November 2011. If this paper is accepted with revisions, the Working Group will update this bibliography to include all papers published till the end of year 2011 and make it more complete. [ABSTRACT FROM PUBLISHER]

Photovoltaic solar farms generate power only during daytime and remain completely idle during the nights. This paper presents a novel technology of utilizing Photovoltaic (PV) Solar Farms in the nighttime. New controls are developed for the solar farm inverters to operate as STATCOM — a Flexible AC Transmission System (FACTS) Controller, using the entire inverter capacity in the night for accomplishing various power system objectives, such as voltage regulation, improvement of power transfer capacity, load compensation, etc. During the daytime, the same objectives can be achieved to a substantial degree with the inverter capacity remaining after real power generation. This technology is termed PV-STATCOM. Two novel applications of solar farms operating as PV-STATCOM in realistic transmission and distribution systems are presented in this paper. These are : i) Improving power transfer capacity of transmission lines.; and ii) Increasing the connectivity of neighbouring wind farms. [ABSTRACT FROM PUBLISHER]