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access icon free Power control strategy for photovoltaic system based on the Newton quadratic interpolation

© The Institution of Engineering and Technology
Received 05/03/2013, Accepted 04/11/2013, Revised 16/08/2013, Published 04/02/2014

To maximise the economic benefit, photovoltaic (PV) systems in general operate in the so-called maximum power point tracking (MPPT) mode. However, in certain occasions (e.g. in a microgrid or in a weak system), it is beneficial for a PV system not to always operate in the MPPT mode, but occasionally in the power dispatch mode, because of the top priority of maintaining system stability. To this end, a Newton quadratic interpolation-based power control strategy for PV system is proposed to iteratively obtain the required terminal voltage of PV system by approximating the power–voltage characteristic curve with a quadratic curve. With this control strategy, PV systems can operate in the power dispatch mode to flexibly adjust the active power output in a wide range, or adaptively switch to the MPPT mode if necessary. Details on the convergence rate and the way to achieve the fault ride-through capability are also discussed. Simulation is performed based on a detailed PV dynamical model, illustrating that the proposed method has fast convergence rate and robust performance compared with a revised perturb and observe method which can attain the same function.

Inspec keywords: power control; interpolation; distributed power generation; maximum power point trackers; photovoltaic power systems; power generation control; Newton method; perturbation techniques; fault diagnosis; power generation dispatch; stability; convergence of numerical methods

Other keywords: PV dynamical model; stability; quadratic curve; power dispatch mode; MPPT mode; fault ride-through capability; power-voltage characteristic curve; observe method; Newton quadratic interpolation; photovoltaic system; convergence rate; power control strategy; terminal voltage; maximum power point tracking mode; microgrid; revised perturb method

Subjects: Distributed power generation; Interpolation and function approximation (numerical analysis); Stability in control theory; Power and energy control; Control of electric power systems; Interpolation and function approximation (numerical analysis); Power system management, operation and economics; Solar power stations and photovoltaic power systems; DC-DC power convertors

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