Harmonic Compensation by PV-STATCOM - 678 Words

For emolument of current harmonics (if any), the instantaneous resoluteness of different active and reactive powers is utilized - the active and reactive powers are computed utilizing p-q theory. No restrictions are imposed on the voltage or current wave forms, and it can be applied to three-phase systems with or without a neutral wire for three-phase generic voltage and current wave forms. Thus, it is valid not only in steady state, but withal in transient states. The p-q Theory first transforms voltages and currents from the a-b-c to ÃŽ ±-ÃŽ ²-o coordinates, and then defines instantaneous power on these coordinates. Hence, this theory always considers the three-phase system as a unit, not a superposition or sum of three single-phase circuits. The p-q Theory utilizes the ÃŽ ±-ÃŽ ²-o transformation, additionally kenned as the Clarke transformation, which consists of an authentic matrix that transforms three-phase voltages and currents into the ÃŽ ±-ÃŽ ²-o stationary reference frames, given by: [ââ€"ˆ(V_0@V_ÃŽ ±@V_ÃŽ ² )]=√3/2 [ââ€"  (1/√21/√21/√2@1-1/√2-1/√3@0√3/2-√3/2)][ââ€"ˆ(V_a@V_b@V_c )] [ââ€"ˆ(i_L0@i_LÃŽ ±@i_LÃŽ ² )]=√3/2 [ââ€"  (1/√21/√21/√2@1-1/√2-1/√3@0√3/2-√3/2)][ââ€"ˆ(i_La@i_Lb@i_Lc )] By utilizing the ÃŽ ±-ÃŽ ²-o transformation the zero-sequence component can be disunited from the a-b-c phase components. The ÃŽ ± and ÃŽ ² axes make no contribution to zero-sequence components. If the three-phase system has three wires (no neutral conductor), no zero-sequence current components are present and i0 can be eliminatedShow MoreRelatedWind Power And Energy Power6573 Words   |  27 Pagespower, namely the frequency and the voltage. However, now the overall power system is changing, a large number of dispersed generation (DG) units, including both renewable and non-renewable sources such as wind turbines, wave generators, photovoltaic (PV) generators, small hydro, fuel cells and gas/steam powered Combined Heat and Power (CHP) stations, are being developed [1]-[2] and installed. A wide-spread use of renewable energy sources in distribution networks and a high penetration level will be