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access icon free Slide mode control of microgrid using small hydro driven single-phase SEIG integrated with solar PV array

© The Institution of Engineering and Technology
Received 05/02/2016, Accepted 03/07/2017, Revised 22/05/2017, Published 04/07/2017

This study presents a susceptance theory-based sliding mode control (STSMC) algorithm for an improved power quality voltage and frequency control of a single-phase microgrid. The proposed microgrid includes a governor-free small hydro turbine-driven single-phase two winding self-excited induction generator (SEIG), a solar PV array and a battery energy storage system (BESS). The non-linear relationship among magnetising reactance, frequency and speed of SEIG along with random fluctuation in active power output of the solar PV array create the major challenge in frequency and voltage control of such renewable energy-based microgrid. The STSMC algorithm is found suitable to control frequency and voltage of such non-linear and complex system. In this proposed control, the system frequency control in dynamics and steady-state conditions and balance of power among various energy sources and BESS are achieved using the sliding mode control. The STSMC eliminates all possibilities of overshoot and undershoot problem in DC-link voltage of the VSC, which in turn reduces the required size of DC-link capacitor and BESS.

Inspec keywords: power generation control; asynchronous generators; variable structure systems; distributed power generation; hydraulic turbines; voltage control; frequency control; solar cell arrays

Other keywords: self-excited induction generator; BESS; power quality frequency control; overshoot problem; active power output random fluctuation; steady-state conditions; VSC DC-link voltage; power quality voltage control; dynamics conditions; undershoot problem; solar PV array; microgrid slide mode control; magnetising reactance; SEIG frequency; DC-link capacitor; small hydro driven single-phase SEIG; governor-free small hydro turbine-driven single-phase two winding SEIG; SEIG speed; battery energy storage system; susceptance theory-based STSMC algorithm; power balance

Subjects: Control of electric power systems; Distributed power generation; Asynchronous machines; Solar cells and arrays; Frequency control; Hydroelectric power stations and plants; Voltage control; Multivariable control systems

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