A bunch of Thai scientists has outlined a brand new strategy to keep away from oversizing and overvoltage in power markets utilizing volt-watt droop curtailment methods. The new methodology results in a discount within the internet current worth of a PV system but in addition will increase the extent of power prices.
Researchers from King Mongkut’s University of Technology North Bangkok in Thailand have proposed a brand new methodology to conduct techno-economic assessments of distributed PV methods that take into account overvoltage-induced curtailment.
The scientists emphasize that, in contrast to earlier strategies for sizing PV methods, the brand new technique will not be supposed to find out the optimum dimension of a photo voltaic array primarily based on maximizing revenue and self-consumption insurance policies. They as a substitute recommend avoiding oversizing and an “extreme acquire,” however say that this alternative results in a considerably improved degree of power price (LCOE), particularly in situations the place the lower is anticipated to extend, on account of a better penetration of renewable power sources.
The analysis group carried out a sensitivity evaluation to evaluate the consequences of various voltage ranges on the discount of era attributable to overvoltage on the techno-economic efficiency of distributed PV methods primarily based on the tariffs of electrical energy set by the Metropolitan Electricity Authority (MEA) of Thailand.
The teachers monitored the load all year long in 2018 and located that the utmost load is at 21.00, with the consumption being the very best in April. “As a consequence, air cooling hundreds have elevated considerably,” they defined. “The load tends to lower when the season adjustments from summer time (March to May) to winter (November to February). The lowest load was famous in December as a result of the temperature is normally nice, which reduces the air-cooling load considerably.”
Electricity costs within the analyzed space vary from $0.176/kWh to $0.057/kWh and a volt-watt droop curtailment technique is assumed to be carried out. This technique requires deploying an extra controller on the level of frequent connection (PCC) and is usually used for native PV energy curtailment. “This technique prevents PV era when the voltage reaches the brink of 1.06 pu, in keeping with ANSI C84.1-2016, IEEE 1547-2018, and IEC 60038-2009 requirements,” the researchers defined.
Their evaluation considers techno-economics parameters, comparable to self-consumption fee (SCR), self-sufficiency fee (SSR), internet current worth (NPV), and LCOE.
They additionally adopted the so-called Jimenez-Castillo PV system sizing optimization strategy, geared toward maximizing NPV values, and contemplating 4 totally different situations: Scenario 0, the place overvoltage and curtailment are uncared for; Scenario 1, the place the overvoltage-induced era curtailment and PV set up location are thought-about and the PV system is put in at every node in every space; Scenario 2, the place PV methods are positioned at every node in two areas; and Scenario 3, the place the PV methods space is put in at every node in every space of the feeder.
Through this evaluation, scientists discovered that, to keep away from curtailment and overvoltage, PV system sizing will be decreased as much as 58.33%, relying on the variety of PV methods and their location. This will end in a lower in NPV of 21.34% but in addition in a rise in LCOE of twenty-two.96%.
“Furthermore, the findings present that SCR barely will increase as much as 11%, however SSR barely decreases as much as 4% when overvoltage-induced era curtailment is carried out,” they added. “Finally, the sensitivity evaluation revealed that the optimum PV capability stays unchanged even when totally different voltage thresholds are carried out. However, the NPV is considerably decreased as much as 25%, and the LCOE elevated as much as 20.72% as the brink voltage decreased to 1.01 pu The SCR tended to extend by roughly 10%, whereas the SSR remained unchanged.
Their findings are within the research”Techno-economic evaluation of grid-connected residential photovoltaic methods contemplating overvoltage-induced era curtailment,” which was not too long ago revealed in Energy Reports.
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