A large number of inductive loads need the reactive power, and the amount of the reactive power compensation is different in a state of work. The traditional static reactive power compensator is difficult to meet the needs of the reactive power compensation for the composite load reactive. Therefore, a dynamic reactive power compensation method of the composite power load is proposed in this paper. The following works have been done in the study: principle of dynamic reactive power compensation control method, topological structure of dynamic reactive power compensation device, and implementation of the dynamic reactive power compensation control method.

The simulated annealing algorithm is applied on traveling salesman problem (TSP), which the genetic algorithm solving in while the earliness phenomena appear. Modeling and Simulation about TSP Based on Simulated Annealing Algorithm have been done. The simulation results have proved that the simulated annealing algorithm is better in searching in the global searching than the genetic algorithm.

The Automatic Test System (ATS) is being increasingly used in the business and professional test. However, there are some potential problems emerged in the application of the distributed test. So we intend to solve the problems by adopting the idea of the Cloud Computing to solve the two challenges: improve the efficient use of the limited and heterogeneous hardware test resources and shorten the test cycle which is defined as the whole time of the test. The paper proposes several structures of the Cloud Test System (CTS): the overall structure, the software and hardware architecture. Theoretically,the study overcomes the challenges of the existing test system, then the foundation of the further study is laid.

The started motors with the discrete frequency converter are characterized by high starting torque and a large number of harmonics when the motors draw heavy-loads. It may pull down the voltage of the power supply net work and influence the other electrical devices. Furthermore, it increases the motor temperature, which may lead to motor damage. Therefore, an integrated device of motor discrete variable frequency starting and harmonic filtering was developed. In this paper, a controller is designed to control the motor during the soft starting/stopping and keep the harmonics in permitted ranges by harmonic filtering. The following works have been done in the study: the needs analysis of the controller, design the hardware based on the PLC and the software design of the controller. The motor starter developed with this controller has been successfully applied to the loads of the drive equipments. It can improve the starting performance when the motors draw the heavy-loads, save energy, stabilize the voltage of the power supply network.

For the burst-type acoustic emission signal, time delay estimation of two sensors calculated by signal cross-correlation is not accurate, and it leads the source localization results is not also accurate. A new method is proposed to improve accuracy of source localization results based on multi-scale analysis and multi-sensors. Acoustic emission signal multi-scale analysis using wavelet transform, then the most accurate time delay is selected in sub-band of signal multi-scale analysis by multi-sensors time delay vector close rule. Finally, the simulation acoustic emission source localization experiment has high accuracy.