Advanced Materials Research Vol. 811

Abstract: As the additional injection type hybrid active power filter (IHAPF) may exist fundamental circulation between the active part and fundamental harmonic branch, a new topology of injection type hybrid active power filter is proposed to enhance the safety of IHAPF in the paper, this paper discusses the principle of fundamental circulation and the advantage of the novel structure on harmonic voltage of series resonant subcircuit.

Abstract: Reactive power optimization is very important to power systems economic operation and nowadays, the research about it gets more and more popular. The paper presents a reactive power optimization algorithm of particle swarm optimization combined with sensitivity analysis. The paper first builds the mathematic model of reactive power optimization and introduces particle swarm optimization. Then, presents the sensitivity method in detail and talks about the process of computing the sensitivity. Finally, take the algorithm into practical application and the results proves that sensitivity analysis could improve the particle swarm optimization algorithm.

Abstract: In order to ensure the safe operation of ship power system, it is necessary to remove some lower priority loads when the generators output power is insufficient, which requires reasonable priority for each ship power system loads. According to the ship loads start-up time, starting current, power factor, harmonic factor and the rated power, the improved grey analytic hierarchy process was used to provide a basis for evaluation of reasonable, which can be used to set the priority of the loads and realize the reasonable distribution of power.

Abstract: After a distribution network failure occurs, how to correctly and quickly restore power supply to non-fault zone is of great significance to meet the user's power supply requirement and to improve power supply reliability. At first, this paper introduces the research status of service restoration algorithm of distribution network, and then analyzes the advantages and disadvantages of various algorithms. At last, it expounds the problems existing in the current distribution network service restoration and makes prospect of research on the distribution network service restoration.

Abstract: Distribution network is the design of closed loop, open loop operation,which segment equipped with a normally closed and normally open switch contact switch,By changing these disconnect switches and contact switch status, the structure of the distribution network reconfiguration, you can achieve a balanced load, reducing network losses and improve voltage quality role.Distribution Network Reconfiguration in mathematics is a multi-objective high-dimensional nonlinear optimization problem, has a great solution space, using the general optimization method is difficult to obtain a good solution.Existing optimization methods such as optimal flow pattern method, branch exchange method, particle swarm optimization, genetic algorithms, computational efficiency and optimization results in other aspects worthy of improvement.

Abstract: Various fault location methods for distribution network at home and abroad are summarized. According to the fault type,the location methods for short circuit fault and earthed fault are introduced. And the basic theories, characteristics, improvement and applications of the representative methods are analyzed. The main problems in the applications of these methods are analyzed. In view of these questions, users requirements and the development of distribution network, the improvement and research about fault location technical are proposed preliminarily.

Abstract: A calculating model is proposed to determinate the extended products with surface transducer. The expressions depending on the curvature of cylindrical product and the distance between transducer and surface of product are derived.

Abstract: In the situation that the traditional energy shortage and environmental pollution problems have become increasingly grim, the new energy research has been widespread concern at home and abroad. Represented by distributed photovoltaic power is gradually from a stand alone system toward large-scale grid direction. However, the PV system chaotic phenomena threaten the stability of the system.

Abstract: In this paper introduced some new subclasses of analytic functions in the unit disc. We obtain some sufficient conditions.

Abstract: Comprehensive budget management as the important tool of enterprise internal control and management goal achieving gradually expose some problems like out of touch with strategy, budget work become a mere formality in the long running process. This thesis puts the concept of EVA into the comprehensive budget management, find out the dominant position of the comprehensive budget management based on EVA, discuss on the comprehensive budget management system building, and seek a new way for the enterprise comprehensive budget management.