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A novel differentiation phase locked loop (dPLL)-based control technique is used for control of a three-phase hybrid wind-solar grid connected inverter (HWS-GCI) with a capacitor-supported DC link. The DC link is simultaneously interfaced to a solar photovoltaic and permanent magnet brushless DC wind generator via unidirectional DC-DC converters, in a two-stage topology, to channelise excess power generation to the grid, thus increasing the energy conversion capability. In addition, the HWS-GCI is used as a distribution static compensator to enhance the dynamic performance of the system, by the use of a novel harmonics isolation control algorithm based on differentiation and variable coefficient proportional-integral-derivative controller. The algorithm possesses fast dynamic response and preserves the mutual relationship of the three-phase currents, allowing the accurate detection of load side or source side phase unbalancing. A comparison of the proposed technique with previously known methods is provided to establish the competency of the algorithm. The experimental performance validation under nonlinear load unbalancing and sudden changes in solar insolation and power generated by a wind generator are considered using the real-time implementation platform.

In this work Enhanced Phase Lock Loop (EPLL) is applied in wind-DG microgrid for harmonics elimination, load balancing, voltage regulation, and reactive power compensation at point of common coupling (PCC) under various load conditions. As the energy generation by the wind is uncertain and unpredictable therefore Permanent magnet brushless DC generator (PMBLDCG) based wind power generation is combined with a diesel engine driven Synchronous reluctance generator (SyRG) DG-set to increase stability of the system. A battery system (BESS) is attached with voltage source converter (VSC) to provide load leveling during heavy as well as light load conditions and low wind conditions. An incremental conductance technique (INC) is used to capture maximum power point (MPPT) in wind energy conversion system (WECS) during variable wind speeds. The proposed microgrid is demonstrated and simulated in MATLAB environment using Simulink and SimPower System (SPS) set toolboxes. The performance of the proposed controllers MPPT of WECS through INC and PCC voltage, harmonic elimination, reactive power compensation, load leveling and load balancing by EPLL is validated in this paper.

This paper takes into account wind-DG hybrid configuration with a voltage source converter (VSC) as a voltage and frequency controller (VFC). Wind AC power generated by permanent magnet brushless DC generator (PMBLDC) is rectified into DC power, and maximum power is captured using maximum power point technique (MPPT) using a boost converter with incremental conductance (INC) approach. This power is stored into battery system (BS) and surplus is supplied to the consumer loads. BS is attached at DC link of VSC which provides load leveling during less or no wind conditions. Diesel engine driven squirrel cage induction generator (SCIG) is feeding loads and VSC at point of common coupling (PCC) to support the system when wind generation is unable to meet out load demand. Back propagation feed forward (BPFF) control scheme is used for VF control of VSC. This controller provides harmonics elimination, load leveling and reactive power compensation and also regulates the voltage at PCC. Microgrid is modeled with MATLAB Sim power tools and simulation resultsare produced to verify the appropriate working of both the converters and the overall system.