Research On The Ability Of High Permeability Photovoltaic Grid Connection

With the continuous development of new energy such as solar energy,wind energy,distributed photovoltaic penetration in distribution networks will climb year by year,while photovoltaic power generation has randomness,volatility and uncertainty,which will affect the safety and stability of distribution networks.Therefore,the PV Delivery ability of distribution network has become an important factor in constraints of photovoltaic power generation.This paper mainly studies the PV Delivery ability of distribution network.In response to the voltage increase in the photovoltaic grid,we propose a inverter-based active-reactive integrated voltage adjustment strategy.This article uses the IEEE 33 distribution network model.At the first,we use the random scene simulation method to initially calculate the PV Delivery ability of distribution network.On this basis,a multi-constrained-based coupled the distribution network’s PV Delivery ability random simulation method is proposed,and use Poisson distribution sampling method is used to optimize the number of photovoltaic access points in the random simulation step.Make the results of the simulation more focused on the vicinity of the voltage boundary plane,which increases the efficiency of the random scenario simulation,making the results more accurate.Secondly,the system is calculated for distributed photovoltaic maximum access capacity.We propose an elite retention strategy chaotic particle group algorithm to solve the maximum access capacity,and establish a photovoltaic dispensing capacity optimization model.By analyzing the results,it is known that the system has a greater access capacity capability when the distributed photovoltaic access point is more dispersed compared to the concentrated Scenes.Using improved particle group algorithm solution,the calculated distributed photovoltaic maximum access capacity is 6188.7k W,which has increased 0.68% and 1.21% compared to traditional PSO algorithms and traditional GA algorithms,which greatly improves convergence speed and accuracy,and proves algorithm efficient.Finally,we propose a inverter-based active-reactive integrated voltage adjustment strategy.When the voltage is higher than the upper limit,it is preferentially utilized the inverter adjustment of the photovoltaic itself;if the capacity of the photovoltaic inverter itself reaches the limit,but the voltage is still higher than the upper limit,then considers the cost and reduction of photovoltaic inverters.The reactive release capability after active output is minimized to reduce the active output to get more reactive power support.This strategy can take into account the efficiency and economy of the photovoltaic inverter,and can effectively alleviate the problem of system voltage output,further improve the maximum photovoltaic capacity.