The arc furnace is a common load in smelting industry. Due to special structure, it often generates great impact on the grid. It has become a recognized technical means to use dynamic reactive compensation device SVC to eliminate the adverse impacts on grid power quality during arc furnace production. However, the electrical system of some arc furnace load containing sites is complex. Limited by the site condition in which sound commissioning environment cannot be provided for SVC, relevant control parameters can only be configured on the basis of experience, which leads to poor compensation effect, and thus affecting normal production of the user.
This paper proposes a new static var compensator control system with SIMATIC-TDC as the master controller and DSP as the auxiliary controller. Siemens TDC is a high-end controller with excellent data processing capacity, which can satisfy the current reactive compensation control algorithm to finish open loop and close loop control. Meanwhile, the programming configuration software is also fully featured, and widely applied in smelting, chemical and power industries. However, the auxiliary controller consisting of DSP and CPLD can quickly finish precise processing of signals (such as high-frequency sampling and signal frequency spectrum analysis). The static var compensation control system consisting of the master controller and the auxiliary controller has now been applied in many projects, achieving sound compensation effect.
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