### Mathematical Model of the Power Circuit of STATCOM of Large Capacity

#### Abstract

The article describes a mathematical model of the power circuit STATCOMs high power, which includes the transformer and converter. The model is developed to analyze the conditions of powerful electromagnetic compatibility STATCOMs with the power supply and minimize the total harmonic distortion of voltage. A distinctive feature of the model is that the twelve-implemented scheme, where the two primary windings are connected in series and the two secondary windings have different groups of compounds. Converter output voltage is formed by comparing the three-level inverter switching angles with the reference signal increases linearly over the period of the supply voltage. Switching angles are calculated based on the method of pulse-width modulation to remove the selected harmonics. In order to improve the harmonic content of the line current inverter power circuit comprises interfacial smoothing reactor. A mathematical model of the power circuit STATCOMs large capacity allows you to get the phase voltages at the output relative to the zero point of the capacitor and to calculate the primary and secondary current transformers. Described solutions and algorithms are implemented by structural modeling package Simulink environment Matlab. The simulation results showed a rather low level of higher harmonics in the mains current converter. Total Harmonic Distortion (THD) of less than 4%, and the most significant are the 35th and 49th harmonics.

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DOI: http://dx.doi.org/10.24892/RIJEE/20150106

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