Distributed Generation And Its Impact On The Distribution Network Power Flow Simulation

With the energy saving depth, environmental protection, increasing attention, the gradual depletion of energy, distributed generation for its clean and environmental protection advantages is playing an increasingly important role, while the number of distributed generation is increasing and the capacity is also more and more, making the distributed generation is no longer confined to a separate self-sufficient, but the formation of large-scale wind farms or photovoltaic electric power grid.Distributed generation into the grid will inevitably have some impact to the original grid, including the power flow, power quality, protection, network losses, the impact of such security and reliability and so on. This paper studies the trend of distributed generation on the impact of the grid power flow; power flow calculation is the basis of grid computing, and is also an important indicator and infrastructure to evaluation grid. Distributed generation into the grid in different ways, different motors into the grid in different ways, based on the analysis of specific motor analysis the grid way, and then analyzes the impact on the grid size, reduce as much as possible to avoid disadvantages.This paper studies the large-scale distributed generation of wind power and photovoltaic power systems and the impact of the power flow. Three main aspects of the work have done.First, generate the wind electric field and solar photovoltaic field simulation environment, according to the given latitude and longitude of the region, in the National Aeronautics and Space (NASA) Web site found the average monthly wind speed and light intensity of one year, when take these basic data into the HOMER software, simulation can generate that year every moment of every day the wind speed and light intensity.Second, build the wind power and the solar photovoltaic power models, Specially, analysis of the doubly-fed variable speed constant frequency(VSCF) wind turbine power characteristics, draft the power handling program during simulation. Third, considering the distribution power output uncertainty of two-phase flow calculation method.Construct containing the double-fed wind turbine wind power model, photovoltaic cell model, using relatively mature software PSASP and HOMER to achieve distribution network with distribution power flow calculation and environment simulation, which has the following advantages:simple method, good performance, fast calculation speed and high reliability; solve the environmental wind generation and photovoltaic cells, including the randomness and uncertainties of the wind turbine and photovoltaic cells for the operation of distribution network simulation problems. Based on the node of IEEE14 standard system, followed by adding wind turbines, photovoltaic cells and wind turbines and photovoltaic cells to run a combination of simulation. The results showed that adding wind turbines and photovoltaic cells, can improve the quality of the voltage distribution network, and make the trend of the distribution is more reasonable.