Mathematical Modelling of STATCOM for Reactive Power Compensation in Power System and Approach to the Renewable Energy

To maintain the voltage stability in the power system it is necessary to balance the flow of real and reactive power which can be achieved by the compensation techniques in the power system. Reactive power plays an important role to maintain the voltage stability in the power system because the flow of reactive power is depends upon the voltage magnitude, in case of voltage magnitude dips the unbalance of reactive power flow will occurs which results in overall instability of the power system So, there is need to design an model which can compensate the reactive power in the system to maintain the system voltage. STATCOM is one of the FACTs device used to maintain the flow of reactive power and hence, voltage stability in power system (Hingorani and Gyugyi, Understanding FACTS: concepts and technology of flexible AC transmission systems, [1]). This paper describes the mathematical modeling with inherent controlling capability of STATCOM helps to compensate the reactive power flow in the system which maintain the voltage stability. This will approach to the DFIG based wind farms using STATCOM also had been applied for offshore wind power plants to satisfy the grid codes (Tanaka et al., Reactive power compensation capability of a STATCOM based on two types of modular multilevel cascade converters for offshore wind application, 2017, [2], Ushkewar and Bodke, Compensation of reactive power in DFIG based wind farm using STATCOM, 2018, [3], Pereira et al., STATCOM to improve the voltage stability of an electric power system with high penetration of wind generation, 2016, [4]).