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access icon free Effective power transfer scheme for a grid connected hybrid wind/photovoltaic system

© The Institution of Engineering and Technology
Received 17/06/2016, Accepted 27/03/2017, Revised 17/02/2017, Published 11/04/2017

A new topology and effective power transfer scheme with minimum number of converters is proposed for a grid connected wind/photovoltaic (PV) system. Distributed generation sources considered are permanent magnet synchronous generator (PMSG)-based wind energy conversion system and PV array system. Two voltage source converters with a common DC-link serve as wind side converter (WSC) and grid side converter (GSC), respectively. The PV array is directly tied to the DC link without any power converter providing variable DC-link voltage. The Perturb and Observe technique extracts the maximum power from PV and the DC-link voltage is set to the maximum power point (MPP) voltage of the PV array. The output DC voltage of WSC is regulated to an MPP PV voltage using an outer proportional–integral voltage control loop. The maximum power from the PMSG and stator voltages is utilised to generate the reference currents for WSC to make stator currents to follow stator voltages. With unity power factor control, the overall VA of the WSC would contribute to the active power transfer and thereby reduce the kVA rating of the WSC in the proposed configuration. GSC tracks the maximum power from wind and PV array, and serves as a shunt active power filter to compensate for the current unbalance due to the connection of non-linear loads at the grid. All these functions are accomplished simultaneously. Various power transfer modes of operation are simulated through MATLAB/Simulink software and its results are validated through dSPACE Digital Signal Processor.

Inspec keywords: wind power plants; distributed power generation; permanent magnet generators; power factor; active filters; power filters; voltage control; photovoltaic power systems; voltage-source convertors; hybrid power systems; stators; maximum power point trackers; synchronous generators; power grids; PI control; solar cell arrays; power generation control; power control

Other keywords: WSC; grid side converter; dSPACE digital signal processor; Matlab-Simulink software; stator currents; voltage source converters; stator voltages; grid connected hybrid wind-photovoltaic system; PMSG-based wind energy conversion system; PV array system; GSC; active power transfer; outer proportional–integral voltage control loop; wind side converter; reference current generation; unity power factor control; perturb and observe technique; shunt active power filter; maximum power point voltage; MPP voltage; permanent magnet synchronous generator; distributed generation sources; effective power transfer scheme; nonlinear loads; variable DC-link voltage

Subjects: Other power apparatus and electric machines; DC-DC power convertors; Distributed power generation; Control of electric power systems; Solar power stations and photovoltaic power systems; Power and energy control; Synchronous machines; Wind power plants; Voltage control

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