HOME / stop confusion why inverters cut out when the grid fails
1. Overview Grid connection in Romania is mainly regulated by ANRE Order no. 59/2013 approving the public grid connection regulation (the “ Connection Regulation ”), which has already been amended twice in 2022 (under ANRE Orders no. 17/2022 and 81/2022) and will soon be amended for a third time.
ANRE has also made several immediate changes to Romania's grid connection processes, including new rules for financial guarantee. Previously required before concluding a connection, the guarantee is now a prerequisite for issuing any new grid connection permit above 1 MW and amounts to 5% of the connection tariff.
However, the Romanian power system is synchronously interconnected with the neighboring system and probably the analysis about the weight of invertor based generation would become regional, not only national. A large share of the solar PV capacities will be non-utility, pertaining to prosumers.
Statistics from the International Renewable Energy Agency show that Romania had 1,414 MW of solar installed by the end of 2022. In July, Romania's parliament adopted a bill mandating prosumers with PV systems with capacities from 10.8 kW to 400 kW to install energy storage systems.
In order to provide grid services, inverters need to have sources of power that they can control. This could be either generation, such as a solar panel that is currently producing electricity, or storage, like a battery system that can be used to provide power that was previously stored.
A grid-tie inverter converts direct current (DC) into an alternating current (AC) suitable for injecting into an electrical power grid, at the same voltage and frequency of that power grid. Grid-tie inverters are used between local electrical power generators: solar panel, wind turbine, hydro-electric, and the grid.
In the United States, grid-interactive power systems are specified in the National Electrical Code (NEC), which also mandates requirements for grid-interactive inverters. Grid-tie inverters convert DC electrical power into AC power suitable for injecting into the electric utility company grid.
4. Grid-connected inverter control techniques Although the main function of the grid-connected inverter (GCI) in a PV system is to ensure an efficient DC-AC energy conversion, it must also allow other functions useful to limit the effects of the unpredictable and stochastic nature of the PV source.
In order to provide grid services, inverters need to have sources of power that they can control. This could be either generation, such as a solar panel that is currently producing electricity, or storage, like a battery system that can be used to provide power that was previously stored.
Inverters with active cooling technology have a clear advantage here, especially in the higher temperature ranges. Since the inverters are significantly cooler inside, they only start to reduce their output power at higher ambient temperatures. This has a positive effect on the yield.
The result is a highly efficient cooling system consisting of a heat sink and a fan that optimally cools the power electronic components inside the inverter. The heart of the cooling system is an innovative fan housing, which is integrated into a recess of a die-cast aluminium heat sink with specially arranged cooling fins.
Modern inverters can both provide and absorb reactive power to help grids balance this important resource. In addition, because reactive power is difficult to transport long distances, distributed energy resources like rooftop solar are especially useful sources of reactive power.
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