High-dimensional Multi-objective Dynamic Optimal Dispatch Of Power System With Wind Farms

With the rapid development of wind power,wind power accounts for an increasing proportion in China's energy structure.Due to the random fluctuation characteristics of wind power,large-scale grid-connected wind power generation has brought great challenges to the development of power grid dispatch schedules.In grid dispatching,how to consider the impact of random fluctuations in wind power and establish a multi-objective dynamic optimization model that comprehensively considers environmental protection,economy,security and other factors,and how to effectively solve multi-objective optimization problems and make scheduling decisions.Which has a great significance.A multi-objective optimal dynamic dispatch model of power system with wind farms is established in this paper first,taking fuel consumption,pollutant emission and power purchase cost as objectives.Aimed at randomness of wind farm output,extreme scenarios are used to represent various possible directions of wind farm output deviating from predicted scenario,and reserve action constraints of conventional units under extreme scenarios were considered,including network security constraints and unit ramp rate constraints,et al.By solving the optimal dispatch model with constraints of forecasting scenario and extreme scenarios,the unit power output schedule and reserve action scheme in each extreme scenario is obtained.The evenly distributed Pareto optimal sets were obtained using normalized normal constraint(NNC)method and GAMS/CONOPT solver to solve the three-objective optimization problem.A method of obtaining complete Pareto frontier by determining the complete part of the Utopia plane within feasible region in the objective function space was proposed.Test results on IEEE 39-buses system and a real provincial power system demonstrate that the proposed model and algorithm can provide more complete dispatching decision information to dispatchers,and obtain the reserve action scheme under condition of fluctuating output of wind farms meeting various operating constraints of the system.In addition,based on the three-objective optimal dispatch,the total network loss of the system is added as the fourth optimization goal,and a four-objective dynamic optimal dispatch model of the power system with wind farms is established,and try to apply the extension of the normal boundary intersection method to solve the problem of four-objective optimal dispatch problem.And taking IEEE 39-bus system as an example,the calculation results show that NBI method can be effectively applied to solve the four-objective optimal dispatch problem and obtain an uniformly distributed Pareto optimal solution set,the compromised optimal solution obtained represents a solution with a higher optimization degree resulting from the coordination and optimization of the four objectives.