access icon free Proficient operation of grid interfaced solar PV system for power quality improvement during adverse grid conditions

The penetration of solar energy into the distribution network is affected by the seasonal and day-to-day variability of the solar power generation. In underdeveloped and developing countries, the power quality (PQ) deterioration issues are primarily observed due to the presence of the weak utility grid. Therefore, smart grid operability is achieved through power exchange along with the improvement in PQ indices by the application of the biquad filter, thereby exhibiting multifunctional control capability. The biquad filter is less affected by quantization errors and involves no additional usage of sensors or control loops, which are the significant advantages observed in its implementation. The biquad filter utilization in this work, includes the estimation of fundamental load current along with mitigation of harmonics, improving PQ, reactive power compensation, and satisfactory performance during voltage unbalance, sag, distortion, swell, and unbalanced loading conditions, which are observed during weak grid conditions. The stochastic inputs of the solar PV array interfaced utility grid system are agitated due to the erratic availability of solar power, and are overcome through an adaptive perturb and observe technique, which uses a variable perturbation step size. Test cases considered here, validate the performance in accordance to the IEEE-519 standard.

Inspec keywords: solar cell arrays; power harmonic filters; reactive power; solar power; photovoltaic power systems; power supply quality; power generation control; biquadratic filters; smart power grids

Other keywords: adaptive perturb and observe technique; proficient operation; reactive power compensation; weak grid conditions; harmonics mitigation; fundamental load current; IEEE-519 standard; variable perturbation step size; biquad filter utilisation; power quality deterioration; solar power generation; multifunctional control capability; grid interfaced solar PV system; weak utility grid; load currents; distribution network; power quality improvement; quantisation errors; grid voltage; adverse grid conditions; solar photovoltaic array; unbalanced loading conditions; control loops; smart grid operability; seasonal day-to-day variability; power exchange; PQ indices; solar energy

Subjects: Power system management, operation and economics; Power system control; Control of electric power systems; Solar cells and arrays; Power supply quality and harmonics; Photoelectric conversion; solar cells and arrays; Solar power stations and photovoltaic power systems

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