TAILIEUCHUNG - Electrical Generation and Distribution Systems and Power Quality Disturbances Part 8

Tham khảo tài liệu 'electrical generation and distribution systems and power quality disturbances part 8', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Power Quality Improvement by Using Synchronous VirtUal Grid Flux Oriented Control of Grid Side Converter 127 transmission line parameters like series line inductance and line to ground capacitance otherwise there is large power oscillation in the grid which leads to power quality problem in the system. Fig. 13. a Output voltage of VSI before the filter b Grid voltage waveform Figure 14 shows the waveforms of DC link capacitor current inverter output voltage and displacement factor. Selection of capacitor is choice on basis of less ripple current in DC link capacitor. In fig. 14 a capacitor is having fewer current ripples. And fig. 14 b is displacement power factor which is having value of almost unity power factor. This is because almost zero-phase angle difference between reference currents and Grid voltages. . reference currents fallows the same phase as grid voltages . Power factor Distortion factor DF is given by formula 128 Electrical Generation and Distribution Systems and Power Quality Disturbances DF 1 V1 THD2 Total power factor DF DPF DF 1 V1 14 15 Total power factor . Fig. 14. a DC link Capacitor Current b Displacement power factor Fig. 15 a shows single phase instantaneous power and fig. 15 b shows three phase average active power flowing into grid. The instantaneous power S which is equal to active power flowing into grid this is due to zero phase angle difference between grid currents and grid voltages from fig. 15 a we can easily observe this fact . instantaneous power will not crossing zero that means reactive component of current flowing into grid is zero only active component of current flowing . Fig. 15 b shows the Power Quality Improvement by Using Synchronous VirtUal Grid Flux Oriented Control of Grid Side Converter 129 three phase active power flowing into grid which is around 160 KW. The oscillatory nature of the power is because of the harmonics present in currents which are .

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