This paper has presented different topologies of power inverter for grid connected photovoltaic systems. Centralized inverters interface a large number of PV modules to the grid. This included many shortcomings due to the emergence of string inverters. where each single string of PV modules is connected to the DC–AC inverter. …

Qatar also set its August Qatar Land crude OSP at $74.00 a barrel. down from $75.25 for the previous month.

This paper evaluates the effectiveness of real and reactive power control. of distributed PV inverter systems. to manage network voltage rise problems while avoiding excessive curtailment of potential solar generation capacity. High resolution PV generation. customer load and network voltage data has been collected at a number of trial sites …

Maduro last month said the country’s gasoline prices. the lowest in the world. should rise to international levels.

For 2020. Barclays said it expects Brent to average $75 per barrel. up from its previous forecast of just $55 a barrel.

In August. Russia pumped 11.21 million barrels of crude daily. almost the same as the July daily production rate.

Previous studies have suggested access to lower cost Chinese solar products could cut costs.

The lab will use AI technology to identify concentrated solar energy locations as well as monitor and analyze levels of air pollutants in the country.

PetroChina’s domestic crude oil production dropped by 1.3 percent in the first half of 2018.

Iraq’s exports from the south were set on a record pace in August.