Study Of Online Voltage Reactive Power Real-time Comprehensive Control System For Distribution System

It is important to control the voltage and reactive power of distribution network for reduce network losses and improve voltage quality. Traditional mechanical switches always are used to switch the transformer/capacitor of distribution. It can produce the impact of current when switching.So it can not be frequent switched. Reactive power optimization needs real-time and reliable data which come from the scene. It’s required to pass the data which contain the line parameters and the compensation capacitor side voltage parameters and load data to the control center through the appropriate communications network. We need to seek methods to address these problems by the development of the power electronics technology and improvement of distribution networks.This paper use AC zero-voltage turn on solid state relay as the transformer/capacitor switching of the distribution. The solid state relay is used as the transformer/capacitor switching to solve the problem of not frequent switching. Appropriate communication network can pass the collected line operating parameters and the compensation capacitor side voltage parameters and load data to the control center. At the same time, it should ensure that the data segment is real-time and reliability. It’s helpful to solve reactive optimization problems when the sudden load changes happen.This paper designed a real-time voltage reactive power control system. The specific control mode as follows:for the network structure of the known systems, at first we should acquire the value of the remote execution of the terminal voltage of each node from the scene of the voltage transformer, and each node of the network load active power, reactive power, power factor and other data which are from the dispatching automation system. Then, it can pass to the host controller through the communication network. Under the premise of satisfy the constraints, the control center optimization algorithm calculated the variable target, then adjust the control variables (This distribution transformer tap stalls and compensation for the number of capacitor banks) in order to achieve the minimum network loss. It can use an improved adaptive genetic algorithm as the core of the control system algorithm. Substitution example calculation by writing the MATLAB program, the analysis showed:the loss of the entire system before and after the control system running within a day, the voltage passing rate of node load power factor indicators have been a corresponding increase, to prove the feasibility of the system.