The Experts below are selected from a list of 5682 Experts worldwide ranked by ideXlab platform

S Aravindan - One of the best experts on this subject based on the ideXlab platform.

Arun M Bhaskar - One of the best experts on this subject based on the ideXlab platform.

Rajiv K. Varma - One of the best experts on this subject based on the ideXlab platform.

  • Enhancement of Solar Farm Connectivity With Smart PV Inverter PV-STATCOM
    IEEE Transactions on Sustainable Energy, 2019
    Co-Authors: Rajiv K. Varma, Ehsan M. Siavashi
    Abstract:

    This paper presents an innovative smart PV inverter control as STATCOM (PV-STATCOM) for obviating the need for a physically connected STATCOM in a distribution network for controlling steady-state voltage and temporary over voltages (TOVs) resulting from unsymmetrical faults. Two 10-MW PV Solar systems are already connected in the distribution feeder of a utility in Ontario, Canada. A STATCOM is installed to prevent the steady-state voltage and TOV issues arising from the connection of a third 10-MW PV Solar Farm at same bus. It is demonstrated from PSCAD electromagnetic transient studies that if the proposed PV-STATCOM control is implemented on the incoming third 10-MW PV Solar Farm, all the above voltage issues are mitigated satisfactorily as required by the utility grid code. This proposed smart inverter PV-STATCOM control therefore eliminates the need for the physical STATCOM, saving an enormous cost for utilities dealing with voltage rise and TOV issues with grid-connected PV systems. Such a control can effectively increase the distributed generator hosting capacity of distribution feeders at more than an order of magnitude lower cost under similar network conditions. Moreover, this novel grid support functionality can open new revenue making opportunities for PV Solar Farms.

  • SSR Mitigation With a New Control of PV Solar Farm as STATCOM (PV-STATCOM)
    IEEE Transactions on Sustainable Energy, 2017
    Co-Authors: Rajiv K. Varma, Reza Salehi
    Abstract:

    This paper presents a novel control of a large-scale PV Solar Farm as STATCOM, termed PV-STATCOM, for alleviation of subsynchronous resonance (SSR) in a steam turbine driven synchronous generator connected to a series compensated transmission line. During nighttime, the PV Solar Farm can operate as a STATCOM with its entire inverter capacity for SSR mitigation. During daytime, if a system fault triggers SSR, the Solar Farm autonomously discontinues its normal active power generation and releases its entire inverter capacity to operate as PV-STATCOM for SSR prevention. Once the subsynchronous resonances are damped, the Solar Farm returns to its normal real power production. Electromagnetic transients studies using EMTDC/PSCAD are performed to demonstrate that a Solar Farm connected at the terminals of synchronous generator in the IEEE First SSR Benchmark system can damp all the four torsional modes at all the four critical levels of series compensation, and return to normal PV power production in less than half a minute. This proposed PV-STATCOM technology can either obviate or reduce the need of an expensive flexible ac transmission system device to accomplish the same objective. Furthermore, this technology is more than an order of magnitude cheaper than a conventional static var compensators or STATCOM of similar size.

  • Harmonic Impact of a 20-MW PV Solar Farm on a Utility Distribution Network
    IEEE Power and Energy Technology Systems Journal, 2016
    Co-Authors: Rajiv K. Varma, Shah Arifur Rahman, Tim Vanderheide, Michael D. N. Dang
    Abstract:

    This paper presents one of the first studies of the harmonic impact of a significantly large photovoltaic (PV) Solar Farm of 20 MW in a utility distribution system. This Solar Farm is a constituent of the 80-MW PV Solar Farm in Sarnia, Ontario, which is so far the largest Solar Farm in Canada. The utility network is modeled in detail using the commercial grade PSCAD/EMTDC software, which is validated through load flow studies conducted by CYME software and correlated with SCADA measurements. The validated network model is used for network resonance study and harmonics impact analysis of the Solar Farms under different network conditions. The harmonics data instrumented for several months were provided by the transmission utility at the two Solar Farm units and at the main feeder substation. These data were utilized for extensive harmonic impact studies with widely different short-circuit levels and network resonance conditions. This paper presents the detailed procedure adopted for performing such harmonic impact studies. It is concluded that this large Solar Farm may not cause any substantial voltage distortion on the distribution network during steady-state operating conditions. However, recommendations are made for utilities to perform such studies to ensure the safe operation of critical loads.

  • new control of pv Solar Farm as statcom pv statcom for increasing grid power transmission limits during night and day
    IEEE Transactions on Power Delivery, 2015
    Co-Authors: Rajiv K. Varma, Shah Arifur Rahman, Tim Vanderheide
    Abstract:

    This paper presents a novel concept of utilizing a photovoltaic (PV) Solar Farm inverter as STATCOM, called PV-STATCOM, for improving stable power transfer limits of the interconnected transmission system. The entire inverter rating of the PV Solar Farm, which remains dormant during nighttime, is utilized with voltage and damping controls to enhance stable power transmission limits. During daytime, the inverter capacity left after real power production is used to accomplish the aforementioned objective. Transient stability studies are conducted on a realistic single machine infinite bus power system having a midpoint located PV-STATCOM using EMTDC/PSCAD simulation software. The PV-STATCOM improves the stable transmission limits substantially in the night and in the day even while generating large amounts of real power. Power transfer increases are also demonstrated in the same power system for: 1) two Solar Farms operating as PV-STATCOMs and 2) a Solar Farm as PV-STATCOM and an inverter-based wind Farm with similar STATCOM controls. This novel utilization of a PV Solar Farm asset can thus improve power transmission limits which would have otherwise required expensive additional equipment, such as series/shunt capacitors or separate flexible ac transmission system controllers.

  • new control of pv Solar Farm as statcom pv statcom for increasing grid power transmission limits during night and day
    IEEE PES Transmission and Distribution Conference and Exposition, 2014
    Co-Authors: Rajiv K. Varma, Shah Arifur Rahman, Tim Vanderheide
    Abstract:

    This paper presents a novel concept of utilizing PV Solar Farm inverter as STATCOM, termed PV-STATCOM, for improving stable power transfer limits of the interconnected transmission system. The entire inverter rating of PV Solar Farm which remains dormant in the nighttime is utilized with voltage and damping controls to enhance stable power transmission limits. During daytime, the inverter capacity left after real power production is used to accomplish the above objective. Transient stability studies are conducted on a realistic single machine infinite bus power system having a midpoint located PV-STATCOM using EMTDC/PSCAD simulation software. The PV-STATCOM improves the stable transmission limits substantially in the night and also in the day even while generating large amounts of real power. Power transfer increases are also demonstrated in the same power system for i) two Solar Farms operating as PV-STATCOMs, and ii) a Solar Farm as PV-STATCOM and an inverter based wind Farm with similar STATCOM controls. This novel utilization of PV Solar Farm asset can thus improve power transmission limits which would have otherwise required expensive additional equipment such as, series/shunt capacitors, or separate Flexible AC Transmission System (FACTS) Controllers.

R Magdal - One of the best experts on this subject based on the ideXlab platform.

Joe Jerry - One of the best experts on this subject based on the ideXlab platform.