Research On Dispersed Wind Generation Planning In Distribution Network

Due to its high energy saving,environmental protection and high flexibility,dispersed wind generation has attracted wide attention and development.in order to ensure the safety,reliability and economy of the whole system,it is necessary to carry out the rational planning of dispersed wind generation in the distribution network.At present,there are some problems in the planning research of this aspect,such as conservative model,slow solution speed and so on,therefore,it is still of great significance and application value to carry out the research on the planning of dispersed wind generation access to distribution network.At first,this paper analyzes the effects of dispersed wind generation access location,access capacity of distribution network reliability,voltage quality and system power flow,expounds the basic thought of dispersed wind generation planning in distribution network.Secondly,the first multi-objective programming model considering distribution network reliability,voltage quality and economic cost is established.In the aspect of reliability,the reliability loss caused by fan and line fault is used as the index to measure the reliability level of the system;in order to deal with the nonlinear non Gauss characteristics of the node voltage in the planning,the node voltage maximum correlation entropy is used as the optimal cost function.Then,according to the characteristics of multi parameter,multi variable and multi-objective,the method of solving the location and capacity of dispersed wind generation is constructed by using the Memetic Algorithm,IEEE3 3 node system is used to test the feasibility of the first model and its algorithm.The results of the planning are better than those of the economic planning and Genetic Algorithm in the aspects of reliability,voltage quality and the acceptance of wind power.Finally,combined with the operational characteristics of active power and reactive power regulation,the second dispersed wind generation planning model considering the power supply reliability of distribution network and the voltage over limit risk is further studied.Among them,the voltage no longer strictly pursue optimal voltage quality,but allow them to part of the more relaxed the limit,the voltage quality requirements though,but to make full use of the voltage regulation capability of future wind power,is conducive to the acceptance of wind power more fully.The example of IEEE33 node system and a practical example show that the second model is feasible and effective in improving the capacity of dispersed wind generation.