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.

In order to solve the fault location problem of single phase to-earth fault in non-effectively grounded distribution network, a new fault location method based on transient frequency of zero-mode current was presented. The difference of transient frequency of zero-mode current between detecting points before and after the fault point is analyzed. This method is realized by the distribution automation (DA) system and does not require additional equipment. The zero-mode current is detected and the frequency of its transient component is calculated by the feeder terminal unit (FTU). The fault section can be located by master station according to comparing the transient frequency at different detecting point on the fault feeder. Results of digital simulation demonstrated the accuracy and feasibility of this 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.