| The Controlled Parallel Reactor is important for restricting the frequency overvoltage, the operating overvoltage and the secondary arc current. It is also important for improving the voltage stability and the transmission capacity of power system. This dissertation based on State Grid's major technology demonstration projects-"study of Xindu 500kV switching station's on Step-controlled shunt reactors (CSR)". The study includes following aspects: principle, simulation and physics model of the CSR, electromagnetic transient simulation, field-test analysis and etc.According to the demand for the power system, controlled parallel reactor is introduced. The parameters of its core and winding are calculated based on the classical theory of transformer design and the character of CSR. Then, set the electrical strength of the thyristor valve at controlled sides, which is according to the regulation rules of the reactor's capacity. The simulation models under each condition are established with all possible conditions in consideration. Electromagnetic transient model for power system simulation is established based on Xindu 500kV on controlled on step parallel reactor project. The influence on power system when the controlled reactor of ultrahigh voltage is used in the grid is analyzed basing on simulation models. The detailed work is as following: secondary arc current's restrained by the controlled reactor and its neutral point small reactor; internal over-voltage's restrained by controlled reactor and MOA; the effect of CSR in power system's stead-state (when float changes). All kinds of conditions are analyzed when the common requirements of system design are taken as the basis and the biggest stability of the system is guaranteed. The results show that the 500kV CSR at Xindu meets all of the requirements of the power system in transient and steady state. The simulation results and the experiment data also meet, which proves the correctness of the simulation. |
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