Research On Reactive Power Compensation Of Distribution Line Based On STATCOM

With the development of rural industry in our country, the load in the rural power network increased dramatically; however, the wide distribution, long distance and load scattered sporadically make the administration of individual reactive power compensation unsatisfactorily. A large amount of reactive power has been transferred on line, which makes considerable line power loss and line drop. The method of dispersing shunt capacitor to compensate the reactive power on line cannot track the changes in reactive load in time, and the compensation capacity is constant, which tends to produce overcompensation or under-compensation, winding up with an unsatisfactory result. In this research, we access the Static Synchronous Compensator with the function of dynamic reactive power compensation into the line, reducing the power loss and voltage drop on the distribution line.In order to reduce the power loss and voltage drop of the distribution line, the paper proposes using Static Synchronous Compensator with the ability of reactive power tracking compensation. On this issue, three aspects of the study have been down: optimal installation position, optimal installation capacity and strategy of tracking compensation. Results are calculated based on IEEE33 test system.Reactive power optimization model has been founded with the aim to optimize the economical efficiency of power system and quality of electric energy. Taking the quickness of the static synchronous compensator's tracking compensation into account, this research has come up with a kind of Ladder interpolation algorithm to certify the load's temporal and seasonal variations to get the optimization cutting capacity of the Static Synchronous Compensator. On this basis, modified adaptive genetic algorithm has been employed to better the Reactive power optimization method. The optimal initial population is based on the sensitivity of the loss of the line to the reactive power. The results of the IEEE33 text system indicated that the embedded Static Synchronous Compensator can effectively reduce power loss and voltage drop of the distribution line.On the basis of the capacity and location of Static Synchronous Compensator, the great randomness of the fluctuating load in a short period, and the great load volatility in the former chapter, self-adaptive filtering algorithm has been employed to trace the changes in the reactive current for a short period, which has considered the possible changes that might be caused by the input noise and measuring error during the Static Synchronous Compensator' long-time running interval; Let Static Synchronous Compensator follow the reactive current changes of the installation point in a certain proportion. The tracking compensation strategy and the capacity switching curve are compared and analyzed.In order to reduce the installation capacity of Static Synchronous Compensator, and reduce the cost. the hybrid compensation system of Static Synchronous Compensator and shunt capacitor is studied. Study on the capacitor capacity selection and grouping method has been down. Coordinate control strategy is used to control the hybrid compensation system.