Power Quality in AC Islanded Microgrids: Technical Framework and State of the Art Review
Calidad de Potencia en Microrredes aisladas AC: Marco de Referencia Técnico y Revisión del Estado del Arte
DOI:
https://doi.org/10.15446/inginvestig.v40n3.89091Keywords:
AC islanded microgrid, Disturbances, field measurements, power quality (en)Microrred aislada AC, Perturbaciones, mediciones de campo, calidad de potencia (es)
In recent years, operation and control strategies in distribution systems have changed due to the increase in the connection of distributed generation sources (DGs). Small local networks with electricity users and DGs are known as microgrids. These microgrids can operate independently (islanded) or in collaboration (interconnected) with the main network or other microgrids. Some advantages of interconnected microgrids include the reduction of losses, an increase in reliability, and decentralized operation under fault conditions. Nevertheless, when a microgrid operates in islanded mode, its electrical characteristics change and, consequently, the severity of power quality disturbances can increase, as well as their negative impact on electronic devices (loads and DG devices). This paper presents a comprehensive literature review of existing studies on power quality disturbances in islanded microgrids and identifies the most relevant needs for future research on this topic. Detailed information is analyzed to compare the differences between disturbance levels in both interconnected and islanded microgrids. In the case of harmonic disturbances, the impact of the different microgrid configurations is also analyzed.
En los últimos años, las estrategias de operación y control en los sistemas de distribución han cambiado debido al aumento en la conexión de las fuentes de generación distribuidas (DGs). Las pequeñas redes locales con usuarios de electricidad y DGs se conocen como microrredes. Estas microrredes pueden funcionar de forma independiente (aislada) o en colaboración (interconectadas) con la red principal u otras microrredes. Algunas ventajas de las microrredes interconectadas incluyen la reducción de pérdidas, aumento en la confiabilidad y la operación descentralizada bajo condiciones de falla. No obstante, cuando una microrred opera en modo aislado, sus características eléctricas cambian y, en consecuencia, la gravedad de las perturbaciones de calidad de potencia podrían aumentar, así como su impacto negativo en dispositivos electrónicos (cargas y dispositivos DG). Este artículo presenta una revisión literaria exhaustiva de los estudios existentes sobre perturbaciones de calidad de potencia en microrredes aisladas e identifica las necesidades más relevantes de investigación futura sobre este tema. Se analiza información detallada para comparar las diferencias entre los niveles de perturbaciones en microrredes interconectadas y aisladas. En el caso de perturbaciones causadas por armónicos, se analiza también el impacto de las diferentes configuraciones de microrredes.
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