In this paper, the problem about the distribution network planning considering distributed generators is researched. Firstly, distribution network planning model is formulated based on economy and security objectives. Secondly, an improved hybrid algorithm is proposed based on ant colony algorithm and genetic algorithm in order to get better performance. Finally, the method has been tested on a typical radial distribution system to demonstrate the effectiveness of the proposed method.

Wind generation can affect the power quality of power supply system in a certain extent at the same time of energy conservation and emission reduction. In order to study the power quality problem of distribution network with wind power embedded, several indices of power quality are defined in this paper, and the doubly fed wind turbine model is established in detail. The voltage deviation, system frequency, and harmonic distortion rate are analyzed based on the simulation data outputted by PSCAD.

There exist many single-phase photovoltaic generations in modern power distribution network, and these distributed sources may be in a certain extent affect the symmetry of voltage. To investigate the impact of photovoltaic generation on quality problem of distribution network, mathematical and digital model of photovoltaic power generation are built in this paper, and the maximum power point tracking control is simulated based on incremental conductance method.

This paper presents the service flow technology based on IEC 61970/61968, and expounds the definition of the service flow and matching method. Service flow technology can support the SOA framework to meet the increasing demand of fusion to electric power information system. An actual service flow case is applied in power information system, the results show that this technology can make better use of IEC 61970/61968 interface, which provide technical methods for the interaction and expansion between information systems.

Sequential turbocharging and inlet/exhaust bypass (STC-CAB) were composited to used on diesel engine, which can expand engine running area in part load and optimize the matching of turbocharger and diesel engine. The simulation was studied based on GT-POWER software in order to investigate the engine performance difference caused by stc-cab system. The simulation results showed that STC-CAB system can make the compressor away from surge area and expand diesel engine running area, improve the performance of torque in low load.