GRID RESILIENCY ISSUES WITH A HYBRID SOLAR-BATTERY SYSTEM

2021-8-20
Zia, Moaz
Harmonics are one of the main power quality issues which needs to be addressed while designing a microgrid. If harmonics are present in the system, they can cause the load to malfunction and damage. With increasing number of non-linear loads and integration of distributed generators (DG) into the power system, harmonic mitigation is of paramount importance. There is a lot of work available in literature which deduce the benefits of integrating battery into the microgrid to improve renewable energy source (RES) fraction but very few studies go over the effect of battery on the power quality of the system. This study presents a detailed analysis of the effect of battery integration on the harmonics of the interfacing converter (IFC) output of PV microgrid. A resonant converter (RSC) controller with a voltage controller is used for the IFC control. For a comparative analysis, the THD for the PV-battery microgrid is compared with the THD of a standalone PV system. The simulation shows that upon integrating the battery the THD of the unfiltered converter output voltage increases from 33.89% to 40.75%. But after filtration of the higher order harmonics, the THD for PV-battery microgrid is 1.89% whereas for the PV microgrid is 2.34%. This shows that the integration of battery increases the high order harmonics due to unbalance in DC-link voltage during switching of charging states of the battery but complements the IFC control to reduce the lower order harmonics. Hence after filtration, the THD of the system is less if there is battery integration. The unbalance generated by battery is also under the acceptable IEEE limits. The impact of battery on the stability of the DC-link and minimizing the reactive power at the output is also discussed. Integration of battery helps in keeping the DC-link voltage more stable leading to lesser amount of reactive power at the output. This is a big advantage of using batteries especially in a weak grid where IFC needs to compensate large amount of reactive power.

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Citation Formats
M. Zia, “GRID RESILIENCY ISSUES WITH A HYBRID SOLAR-BATTERY SYSTEM,” M.S. - Master of Science, Middle East Technical University, 2021.