Power Quality in the “Shore to Ship” System – The Improvement of the Unbalanced Voltage Factor
The emission of air pollution in ports originating from land sources (factories, cars, trains) has been drastically reduced in the last twenty years by implementing strict emission standards. The pollution generated by ships at berth in ports is currently unacceptable. One of the effective ways to reduce the negative impact of ships at berth in ports on the environment is to use “Ship to Shore” (STS) which stands for a supply of electricity to the ships from the local power stations. It makes it possible to disable and be independent from autonomic ships’ diesel generator sets in port.
The problem of improving the quality of power supply requires an interdisciplinary preparation within the field of electrical engineering and continuous updating of knowledge. The quality of electricity supplied in the STS system is related to the safety of use of marine systems and economic functioning of the ship. The requirements related to the power quality are determined by the appropriate rules of ship classification societies. In order to determine the quality of electricity, the quality parameters are used. One of the parameters that is important for power quality assessment is the voltage unbalance. This paper presents a method aimed to improve the voltage unbalance factor within the STS system with the use of power electronic active filters.
KeywordsAir pollution from ships in port Shore to Ship system Voltage unbalance factor Transformation of the coordinate system Shunt Active Filter
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