Simulation And Strategy Research Of The Generator Unit Grid-connected Test Based On DIgSILENT

With the continuous emergence of large capacity and high parameter units,the safety and stability of the generator set in the grid connection becomes very important in the operation of the power system.Once the accident occurs,the adverse effects of the generator will become more and more serious.Before the grid connected generation,the generator set must be connected to the grid to achieve the requirements of rules,specifications and standards.Because the power structure of our country is still dominated by hydropower and thermal power,it is particularly important to study the grid connected test of two generating units of hydropower and thermal power.This paper analyzes the common problems in the process of grid connected test of hydropower units and thermal power units,and points out that the problem of long line capacitance effect and the problem of electric and electromagnetic ring network of factory are the most common and urgent problems to be solved in the process of grid connected test of hydropower units and thermal power units.Because of the excellent functions and characteristics of DIgSILENT/PowerFactory software,it has a certain advantage to use DIgSILENT/PowerFactory software to study the problem of grid connected test of generator set.This paper analyzes and studies the problem of long line capacitance effect and the problem of electric electromagnetic ring network of the factory.According to the theory,it analyzes the causes of the two problems and the influence on the system,and puts forward their respective best solutions.Then,based on the DIgSILENT/PowerFactory software simulation,the theoretical analysis and analysis of the two kinds of problems are verified and analyzed.According to the theory of the best solution strategy,the concrete solutions are obtained,and the superiority of the solution strategy is verified by simulation.The results show that the proposed solution strategy is reliable and practical,and has scientific guiding significance for engineering practice.