Photovoltaic (PV) power among all renewable energies had the most accelerated growth rate in terms of installed capacity in recent years. Transmission System Operators (TSOs) changed their perspective about PV power and started to include it into their planning and operation, imposing PV systems to be more active in grid support. Therefore, a better understanding and detailed analysis of the PV systems interaction with the grid is needed; hence power hardware in the loop (PHIL) testing involving PV power can be a solution to address the testing challenges. To test PV systems for grid code (GC) compliance and supply of ancillary services, first the grid has to be simulated using PHIL, but in order to achieve it, different interface algorithms (IA) had to be evaluated in terms of system stability and signal accuracy
In April 2012, a consortium of 12 partners started the REserviceS project aiming at establishing reference guidance for the development of European network codes and electricity market design with large share of variable renewables. One step in achieving this goal is to investigate the capabilities and availability of ancillary services provision from distributed generation (DG) under different scenarios, to assess these capabilities under different grid conditions and to also perform the related economic assessment. The methodology used for these investigations is presented in this paper
The share of distributed generation (DG) within the distribution network increases strongly. A lot of these DG units are driven by Renewable Energy Sources (RES). Up to now, these units only inject active power depending from the availability of their primary source. In future on the one hand DG units have to contribute to grid stability, but on the other hand DG units can provide additional functionalities in order to offer a surplus value for the customer. Therefore especially inverter-coupled systems are well suited. Additional functionality could be improvement of Power Quality and Reliability (PQR), but also peak shaving, provision of control energy or reactive power compensation is conceivable. This paper presents several approaches of such multifunctional inverter systems developed by ISET e.V., SMA and TU Sofia with the focus on PQR.
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