Dr. Muhammad Asghar Saqib

Reactive power compensation is necessary as more reactive power draws large reactive current which lower the power transmission capability and leads to an increase in the cost of electricity. The aim of this project is to design and control a thyristor controlled reactive power compensator for dynamic loads. Traditional static VAR compensators like fixed capacitor thyristor-controlled rea ctor generates lower order harmonic currents which deteriorate the system performance. STATCOM devices are also used for reactive power compensation. They have comparatively faster response with less harmonic injection. But the problem with STATCOM is that under same VA rating SVCs are much cheaper. So, our aim is to design a VAR compensator that combines good features of both SVC and STATCOM i.e. it is cheaper and also has a feature of harmonic current rejection. Furthermore, the control method is based on instantaneous reactive power theory rather than traditional theory for faster response dynamic loads. Load instantaneous reactive power is monitored continuously to determine the reactive power that must be supplied or absorbed by the compensator and the required reactance is calculated that must be provided using lookup table and firing angle alpha is calculated at which thyristor is to be fired for the required compensation. Both leading and lagging reactive power can be provided and power factor can be adjusted accordingly for lagging and leading loads respectively. The value of inductors and capacitors is calculated according to required reactive power range that has to be provided by the compensator using equations. The simulations for this compensator design are done on PSCAD (Power System Computer Aided Design). With PSCAD TM we can build simulate and model power systems with ease providing limitless possibilities in power systems simulations. Wind generators tied to smart grids specifically require TCLC so it has great future aspects. Moreover, simulation and experimental results have proved that TCLC can provide VAR compensation with acceptable grid voltage and system current THD levels. So, the proposed TCLC can be considered a costeffective solution for reactive power compensation with less harmonic injection in smart grid system.

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