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access icon free Improved robust-mixed-norm-based controller for grid-tied PV systems under voltage disturbances

© The Institution of Engineering and Technology
Received 30/01/2020, Accepted 16/03/2020, Revised 01/03/2020, Published 25/03/2020

The grid-tied solar photovoltaic system requires a multiobjective control approach for performing the dual operation of active power transfer at unity power factor and harmonic filtering. In this context, this study proposes an improved robust-mixed-norm (RMN) filter-based multiobjective control strategy for integrating the solar photovoltaic system with the utility grid. The standard RMN filtering control exhibits slow convergence, requires large sampling time and involves high computational cost. Therefore, a switching parameter is designed to toggle between least mean square and least absolute deviation for extracting the benefits of both filtering techniques as per requirement. The switching parameter will also help in minimising the computational intensiveness during hardware implementation and successfully confronts the conflict between convergence speed and steady-state misadjustment in the presence of outliers. The proposed control is implemented with the help of multiple delayed input vectors to extract the fundamental weight component from the non-sinusoidal load current. In addition, the effects of grid voltage distortion and imbalance have been detached by using complex vector filter-based synchronisation technique. The practicality of the proposed multiobjective approach has been verified under different operating conditions of supply and load through both MATLAB/Simulink tool and low-cost microcontroller-STM32F407VGT6-based laboratory prototype.

Inspec keywords: control system synthesis; power supply quality; power grids; microcontrollers; synchronisation; adaptive filters; power factor; power engineering computing; robust control; power harmonic filters; photovoltaic power systems

Other keywords: robust-mixed-norm filter-based multiobjective control strategy; unity power factor; utility grid; multiobjective control approach; standard RMN filtering control exhibits slow convergence; switching parameter; grid voltage distortion; grid-tied solar photovoltaic system; voltage disturbances; complex vector filter-based synchronisation technique; harmonic filtering; multiobjective approach; high computational cost; active power transfer; dual operation; filtering techniques; grid-tied PV systems; least absolute deviation

Subjects: Power convertors and power supplies to apparatus; Optimisation techniques; Stability in control theory; Other power apparatus and electric machines; Power supply quality and harmonics; Other topics in statistics; Solar power stations and photovoltaic power systems; Control of electric power systems; Control system analysis and synthesis methods; Power engineering computing; Interpolation and function approximation (numerical analysis)

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