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To improve assessment accuracy, this paper proposes an insulation evaluation model based on an evidence reasoning approach combined with the fuzzy theory, which obtains weights of each parameter objectively and construct the distribution of belief function with uncertainty effectively. Firstly, main insulation parameters for condition assessment are presented, then relevant condition evaluation algorithms...
The thermal dynamics of transformer is a critical issue during operation, since it limits the lifespan and the load capacity of transformers. This paper introduces a finite element method (FEM) coupled fluid-thermal to investigate the thermal performance of oil-immersed power transformers. A two-dimensional (2-D) axially symmetric model is established, according to the basic parameters of a 250 kVA/10kV...
The installed capacity of photovoltaic (PV) generation in residential distribution system is growing rapidly around the world. While integrating PV into the distribution systems can provide a range of benefits, a severe issue caused by high-level PV penetration is the reverse power flow along the distribution feeder. Due to the high R/X ratio in the distribution systems, real power exporting can lead...
It is known that Deterministic N-X criteria based power system planning can cause redundancy when satisfying reliability requirement. Instead, the probabilistic reliability criterion are a trade-off option between reliability and economy. Nevertheless, the combination of economy and reliability indices is difficult to be handled and there are no effective methods existing in current literature. In...
In order to expand work time window under high sea state, hydrostatic secondary control was proposed to winch system of ship-mounted crane to reduce influence of vessel motion. System models of passive and active heave compensation mode were simulated. Cascade control strategies based on conventional PID and fuzzy PID were used to active heave compensation (AHC) system. As a result, approximate 90...
A novel plasma enhanced atomic layer deposition (PEALD)-grown mixed-phase/nano-laminate barrier has been developed which combines the robust barrier properties of TaN with direct plate characteristics of Ru. It was observed that the mixed phase barrier as thin as 2-5 nm can be designed to act both as robust copper barrier and as a copper direct plating layer by modulating the Ru: Ta ratio in the deposited...
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