Abstract
Wind power systems have great potential due to its inexhaustible nature and benign environmental impacts. Especially in remote areas, where wind is plentiful, but it is difficult to get grid-connected power, an off-grid wind power system is an effective alternative for power supply. Reliable and safe operation of the generating system are essential for electricity production and supply. Importance analysis to identify key components of the system is a critical part of reliability assessment. This paper proposes an importance analysis–based weight evaluation framework for identifying key components of multi-configuration off-grid wind power generation systems under stochastic inputs. In the framework, the joint importance analysis based on Birnbaum importance and Criticality importance are introduced to analyze the system reliability and failure rate. Wind speed with stochastic characteristics, load demand with multiple scenarios, and energy transfer with different paths are also merged into the evaluation framework. The results reveal that the rectifier, battery, discharge load, and valve controller dominate the reliability of the off-grid wind power generation system. High priority should be placed on these components during the design phase and maintenance stage. The proposed approach is a positive step forward in promoting component importance analysis and providing more theoretical supports in system design, reliability analysis, and monitoring scheme formulation.
Highlights
Exploitation of renewable energy sources (RESs) has been prioritized around the world since the “energy crisis” of 1970s [1,2,3]
An off-grid wind power generation system is established by taking household electricity as an example
The wind turbines are required to supply more than 65% of annual electrical power consumption for this family consumer
Summary
Exploitation of renewable energy sources (RESs) has been prioritized around the world since the “energy crisis” of 1970s [1,2,3]. Many countries have set strategic plans to develop technologies for supporting sustainable wind power development, especially in areas with rich wind energy sources [8]. Off-grid wind power systems have greater advantages in remote places such as mountainous areas, islands, coastal areas, and other places where wind energy is abundant and where it is temporarily unable to achieve grid-connected power supply [9,10,11]. The reliable and safe operation of wind power systems is one of the key factors for power transmission and distribution [12]. In the design phase of a wind power system, the importance calculation is needed to help the designer to identify the weak points of the system and provide support for the reliability improvement and optimization
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