Efficient photovoltaic system maximum power point tracking using a new technique

Partial shading is an unavoidable condition which significantly reduces the efficiency and stability of a photovoltaic (PV) system. When partial shading occurs the system has multiple-peak output power characteristics. In order to track the global maximum power point (GMPP) within an appropriate period a reliable technique is required. Conventional techniques such as hill climbing and perturbation and observation (P&O) are inadequate in tracking the GMPP subject to this condition resulting in a dramatic reduction in the efficiency of the PV system. Recent artificial intelligence methods have been proposed, however they have a higher computational cost, slower processing time and increased oscillations which results in further instability at the output of the PV system. This paper proposes a fast and efficient technique based on Radial Movement Optimization (RMO) for detecting the GMPP under partial shading conditions. The paper begins with a brief description of the behavior of PV systems under partial shading conditions followed by the introduction of the new RMO-based technique for GMPP tracking. Finally, results are presented to demonstration the performance of the proposed technique under different partial shading conditions. The results are compared with those of the PSO method, one of the most widely used methods in the literature. Four factors, namely convergence speed, efficiency (power loss reduction), stability (oscillation reduction) and computational cost, are considered in the comparison with the PSO technique.

Kerstin Thompson Architects : exploring affect in interior's sticky design process

Physical things influence emotions and feelings and can contribute to our sense that buildings and rooms are appropriately designed for their purposes. The sense of appropriateness extends, and is often noticed, through the pre-emotive effect of a structure’s shapes and dimensions. In interior discourse the relationship between the physical and pre-emotive is indicated with various terms (such as “affect”) and the design process of achieving appropriateness in objects and affect can be termed “stickiness”. In this paper we extend Sara Ahmed’s characterization of affect as a sticky connective element, which allows objects and ideas to generate attachments with us. And we ask, how can we understand interior practices and design processes through the concept of affect – as sticky? We explore this question first by discussing affect’s stickiness, and second, by an empirical study of the design process of Kerstin Thompson’s Monash University Museum of Art. The specific project involves alternating design methods that Thompson uses: an intuitive hunch-driven process, and a more defined literary-driven process. Our interest is to consider how she shifts from one to the other so we can better understand interior practice and its design process through the concept of affect. Finally, we conclude by addressing how the study of affect contributes to our understanding of interior practice and its design process, and more significantly, how, in exchange, might interior practice offer to recent theories of affect. Interior practice as changeable, spatio-temporal and material processes offer potentially fertile ground to explore affect as mediating layer, bridging human and non-human forces.