Constant Power Flow Control Method for Photovoltaic Grid Connection Points Under Changes in Photovoltaic Array Output
With the large-scale integration of renewable energy into the grid,photovoltaic systems need to consider more control objectives.Therefore,a new method of constant power flow control for photovoltaic grid connection points is proposed.Firstly,based on the principle of distributed output compensation,a distributed power flow control structure is constructed.Secondly,using the theory of similar days and BP neural network to predict the output of photovoltaic arrays,the constant value of power flow is derived.Then,with the goal of minimizing the cumulative error and total network loss,set the objective function.Finally,the nonlinear diffusion particle swarm algorithm combined with the nonlinear incremental strategy is used to solve and obtain the optimal control parameters.The results show that after 70 h of implementation of this control method,the average grid loss of photovoltaic grid connected operation is 2.2 kW/h,which proves the practicality of this method.
万方数据
维普
