Locating And Sizing Of Distributed Generation And Its Impacts On Distribution System Reliability

Smart grid is the development direction of modern power grid, which requires future distribution network to accept distributed generation (DG) freely. However, If DG, particularly intermittent and renewable distributed generation, which has the feature of dispersion and randomness, large access to distribution networks will affect the whole system's safety and stability, such as power loss, voltage stability, power quality, relay protection, power supply reliability and so on.The location and capacity of DG have great influence on distribution network, so issues on locating and sizing of DG are discussed in this paper. In order to effectively reduce network power loss and improve voltage quality, the models of different type of DG used in power flow calculaiton are introduced, and voltage stability index is also analyzed in detail. Then DG locating method based on voltage index is presented, and the influence of DG on network power loss and voltage quality in distribution network is analyzed. In addition, the objective function of DG locating and sizing to reduce network power loss and improve voltage quality is proposed, and hybrid intelligent algorithm is used to solve it.With the access of massive Intermittent Renewable Distributed Generation (IDG), study on the influnce of IDG to system reliability becomes to be a problem to be solved. Therefore, this paper proposes a new method to use Monte Carlo time sequential simulation to accurately evaluate the reliability of distribution system with IDG such as wind power generation, photovoltaic generation, etc.Area equivalent network is formed according to the boundary of the switch device; Using Monte Carlo method to simulate the output power and establishing an time-series model; The sequential monte carlo method based on synchronous sampling and including the influnce of IDG and random load. The proposed method is used to calculate the raliability of one main feeder of IEEE-RBTS BUS6. Different scheme is compared from the point of view of the kind of DG, its location, capacity, ect, and then some concultion can be made, which will be an reference to the planning of the muli-energy complementary distribution system.