Study On The Key Techniques Of The Controller For High Voltage Static Filter And Reactive Compensation

The harmonic and the reactive power are the primary factors that affect voltage stability and power loss of the power system. Direct current electric arc furnace has a more and more great influence on the power quality with its wide application in industry. This essay analyzes the theory of direct current electric arc furnace and points out how it affects the power quality. Based on the analysis, a mixed type controller of high voltage static filter and reactive compensation device-TCR&TSC is devised. In the design of the controller, LPC2368is adopted as the main control chip. And ATT7022C is adopted to form the electrical measuring parameters transform circuit; FFT algorithm is adopted to process the original data. The function of harmonic analysis for the direct current arc furnace system was realized in the controller. When the reactive compensation capacitor is off, the thyristor valve zero trigger method is used to control threw cutting capacitor set for suppressing the inrush current, in order to prevent the power factor overcompensation. we adjust the current of reactor by controlling conduction angle a. A human-computer interaction module and data storage circuit are also designed in the controller for operating and managing control system easilyIn the software, modular design idea is used in designing data analysis, threw cutting control, fault protection, data storage, communications and man-machine interactive modules.. In the essay, we analyze the parameter by using FFT algorithm, and control threw cutting capacitor set by using a reactive power control mode, which is based on voltage calibration. Protection function is realized by cuting capacitor set and reactor in sequence when grid voltage or grid distortion exceeds the set value. The controller also adopt suitable anti-disturbance measures on two aspects of hard ware and software.Finally, by adopting the controller in a13kA/60V direct current electric arc furnace compensation system, parts of the controller’s function have been tested. The results of the test show that the controller can be used in the system to gain a preferable compensation power factor. The controller has a good application prospect with the advantage of rational design, high calculation precision and fast response speed.