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Leaf diseases may harm plants in different ways, often causing reduced productivity and, at times, lethal consequences. Detecting such diseases in a timely manner can help plant owners take effective remedial measures. Deficiencies of vital elements such as nitrogen, microbial infections and other similar disorders can often have visible effects, such as the yellowing of leaves in Catharanthus roseus...
This paper describes an improved matrix converter (MC) commutation process. The paper reviews existing commutation methods including the overlap and dead-band approaches and then two-, three- and four-step commutation processes. Their limitations are discussed and an improved four-step commutation process is proposed. The paper categorises switches as one or two active devices, or degree of freedom...
In this paper Instantaneous Reactive Power (IRP) theory is applied to develop an improved modulation method for Matrix Converters (MCs) operating with unbalanced loads. IRP theory shows that, for unbalanced loading conditions, the instantaneous power contains a constant component and a component that fluctuates at twice the fundamental frequency. In conventional modulation schemes the power fluctuation...
In this paper a Matrix Converter (MC) has been used with a series voltage injection transformer to regulate the voltages on a Medium-Voltage (MV) rural distribution feeder. This approach is well suited to pole top regulator applications as DC bus capacitors are avoided. The MC is controlled using a Space Vector Modulation (SVM) method that is capable of regulating the positive-sequence voltage on...
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