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September 2020

Load Displacement & Renewables Capacity Credits

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By Mohammad Shahidehpour, Tao Ding, Ming Qu, and Quan Zhou

In 2019, there was an additional 25.74GW of wind power installation in China, of which 23.76GW is the onshore installation. The installed wind power capacity accounts for 10.4% of the installed power generation capacity by the end of 2019. The wind power generation in China has reached 405,700GWh in 2019 accounting for 5.5% of the total generated energy. The proliferation of wind power generation in China has brought about green energy, diversity of the national energy portfolio, and reduced carbon emission. The deployment of variable renewable energy has also posed an enormous pressure on power grid operations and the reliability of power delivery. Hence, it is imperative to determine the available capacity credit of variable wind power generation considering its rapid development in various parts of the world.

By Shamsul Aizam Zulkifli, Mubashir Hayat Khan

The impact of the circulating current at a localized Microgrid is severe to the voltage, phase, and frequency at the inverter outputs and may lead to system failure.  Each Distributed Generator (DG) has different impedance types such as resistive impedance or inductive impedance which create different amounts of circulating current and new current flow paths inside the inverter. Circulating currents reduce the efficiency of power flow between the inverter and the Point of Connection (PCC). The most severe impact of the circulating current is at parallel inverters network due to line impedance mismatch.

By Sifat Amin and Mehrdad Boloorchi

Battery energy storage systems (BESS) are emerging in all areas of electricity sectors including generation services, ancillary services, transmission services, distribution services, and consumers' energy management services.

Pardis Khayyer of Aptiv Corporation discusses how she got involved in smart grid research and where she feels the field is headed in the future.

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