Integrated control of AC-DC converter with harmonics reduction and reactive power compensation for grid application

Ac to DC converter is used for operating DC electrical machine and also supplies DC power to battery which is used for many purposes. The main purpose of this project is to compensate the harmonics by using harmonic current compensation and reactive power control. If reactive power is compensate prior to system then non linearity or harmonics present in the system does not much affect the existing system. In industrial low and medium voltage mains, passive filters and PFC capacitors have traditionally been used to improve the supply quality. However, they cannot be rated only for the loads being compensated. They are affected by harmonic currents from other non-linear loads or by harmonics from the power system. Compared with passive element compensators, an active harmonic compensator (AHC) can be used to improve the supply quality without worrying about all the problems associated with applying passive elements. The proposed active harmonic compensation AHC for industrial networks can be successfully used with nonlinear loads and consumers with rapid fluctuations of reactive and active power consumption to improve the supply quality of other loads supplied from the same mains. Clear reduction of the voltage wave form distortion and the voltage changes (flicker effects) as well as the stabilisation of the mains voltage are the main advantages of the proposed AHC. These all make the application of the power electronics to improve the supply voltage quality in industrial networks more effective in comparison to passive filters and PFC capacitors.