Typical Voltage Quality Optimization Strategy For Distribution Network

The voltage quality problems existing in the distribution network have a negative impact on the safe operation of the power system and the normal power consumption of the user.Due to the large number of distribution network nodes,the voltage quality between the nodes affects each other,and the factors that cause voltage quality problems are more complicated.Therefore,the typical voltage quality problems existing in the distribution network are analyzed to find out the causes of the voltage quality problems,and specific optimization strategies are proposed for each reason.Through the power supply voltage acquisition system to analyze the actual distribution network,find out the root cause of the voltage quality problem,and classify and summarize these reasons.It is found that there are six reasons for the voltage quality problem,namely: heavy overload of line or station area,excessive power supply radius,unbalanced three-phase load,impact load access,unreasonable transformer tap position or unreasonable reactive power compensation.The acquisition device is faulty.Heavy overload of the line or station area,excessive power supply radius and unbalanced three-phase load are planning problems.With the upgrading and upgrading of the distribution network,the problems in the planning stage are gradually being solved.However,the construction period of retrofitting lines and stations or new power points is too long,and the existing voltage quality problems still need to be solved during construction.Therefore,it is solved during the construction by adjusting the transformer tap position,accessing the distributed power supply and installing the reactive power compensation device.Impulsive load access,unreasonable transformer tap position or unreasonable reactive compensation and acquisition device failure are operational problems.Among them,the problem of impact load access,unreasonable transformer tap position and unreasonable reactive power compensation is solved by improved genetic algorithm.For the failure of theacquisition device,on-site investigation is needed to solve the problem.In this paper,a specific optimization strategy is proposed for the cause of the voltage quality problem,which is implemented by an improved adaptive genetic algorithm.At the same time,considering the sum of the voltage deviations of each node and the active loss,the real-number coding is used to determine the distributed power supply access position and capacity,the transformer tap position and the reactive compensation capacity.In this paper,the number of variants in the mutation operation is improved,and the number of mutations in the chromosome is adaptively adjusted to increase the global search probability.The optimal individual preservation strategy and elimination mechanism are adopted to accelerate the convergence speed of the algorithm.Tested at the improved IEEE33 node and IEEE69 node,the weighting of the sum of active loss and voltage deviation is used as the objective function to improve the overall voltage quality while minimizing the total active loss and improve the economics and stability of the distribution network.