Controlling of Power Transformer Tap Positions (OLTC) Using Facts Devices
DOI:
https://doi.org/10.5281/zenodo.4249184Keywords:
On-Load Tap Changer, FACTS, AVR, Power Transformer, Tap Change Positions, MATLAB SimulationAbstract
Modern power system needs to monitor the power transformer frequently. In an earlier years mechanical types of on load transformer is used. The mechanical transformer tap changes is consists of following issues like manpower, arcing, frequent maintenance, also service costs. To overcome those power electronic as well as solid state tap changers were developed. It deals with power semiconductor devices like as IGBT (Insulated Gate bipolar Transistor) TRIAC, which allows to develop the quick operating on load tap positions. This power semiconductor is helpful for fixing flicker and sags. By varying the tap positions the voltage is controlled by FACTS devices. The control devices along with power electronic devices is connected with AVR (Automatic Voltage Regulator). The FACTS based power transformer is control the tap positions by injecting the voltage is taken from the receiving side of power transformer. This injecting voltage compared with predefined voltage in ALTC device. FACTS devices are installed in AC transmission grid to increase voltage regulation, grid stability, and controllability of the tap positions of transformer through series and/or shunt compensation using capacitor banks. These capacitor banks are connected to the transmission system using breakers. The main purpose of the automatic load tap changing for power transformers is to keep the voltage on lower voltage side of power transformer within a preset deadband.
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