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A way to describe the LLC ballast in tranconductance Gm mode for current conversion to drive LED streetlight is proposed. On Gm description, the load response can be clearly observed in Region 2 since the transfer curves can be expanded outward as per the increase of the quality factor, and no curves huddled; in contrast, it is difficult to obviously view the load behavior in that region by using...
DC system for solar photovoltaic (PV) application is gaining popularity due to high efficiency and reliability. This system could be interconnected to ac and dc grids. For high availability of power supply to loads, energy storage elements are interconnected using dc-dc converters. Power management control for this system is necessary to ensure high utilization of renewable sources and stable operation...
The paper firstly establishes a port-controlled Hamiltonian dissipation (PCHD) based model of a direct-drive permanent magnet synchronous generator (D-PMSG). A new double loop control of the D-PMSG is proposed with the outer speed loop controlled by a non-singular higher-order terminal sliding mode (NHTSM) controller to undertake maximum wind power point tracking (MPPT). In the inner current control...
A four switch, low power, battery integrated, photovoltaic stand-alone inverter system is proposed in this paper. The proposed topology is derived by combining a DC-DC bidirectional converter with a Ćuk based inverter. The derived topology has a simple structure consisting of four switching devices and an isolation transformer. A simple integrated control strategy for maximum power point tracking...
This paper introduces a standalone hybrid power generation system consisting of solar and wind power sources and a DC load. A supervisory control unit, designed to execute maximum power point tracking (MPPT), is introduced to maximize the simultaneous energy harvesting from overall power generation under different climatic conditions. Two contingencies are considered and categorized according to the...
This paper proposes a modified maximum power point tracking method (Perturbation and Observation) based on the use of the information from the derivative of power and the derivative of the voltage on the PV panel. The main contribution of this work resides in the employment of the derivative of voltage that is used to determine instantaneously the increment or decrement ratio of the converter duty...
A hybrid Maximum Power Point Tracking (MPPT) method without using an irradiance sensor is proposed in this paper. The hybrid MPPT method is a combination of conventional Perturb and Observe (P&O) and Fractional Short Circuit Current (FSCC) MPPT technique. The proposed hybrid MPPT decides intelligently about the initial operating point of P&O by using the FSCC MPPT method. This method requires...
This paper presents a comparive analysis between four Maximum Power Point Tracking (MPPT) algorithms in centralized grid-tied Photovoltaic (PV) systems. The algorithms are used to control the duty cycle of a DC-DC converter in order to boost the output voltage of the PV generator and guarantee the operation of the solar panels in the Maximum Power Point (MPP). Three of the analyzed algorithms correspond...
A novel Maximum Power Point Tracking Technique (MPPT) based on Fixed Frequency Model Predictive Control (FFMPC) for Photovoltaic (PV) is developed through this paper. The Proposed control system consists of two-stage. The first stage is a Modified Incremental Conductance (MIC) algorithm and the second stage is FFMPC. The proposed control system has some inherent features such as fast MP tracking under...
In this work we study a new Improved Adaptive Incremental Conductance (IAIC) algorithm proposed originally by A. Morales-Acevedo for maximum power point tracking (MPPT). The maximum power point is searched by means of an adaptive correction of the DC-DC converter duty cycle which is determined by the sum of the incremental and the instantaneous conductance at a given time. The operating principle...
This paper provides an experimental evaluation of a four phase Floating Interleaved Boost Converter for a photovoltaic power system application. This converter offers improved efficiency and voltage gain, while having lower input current ripple than other DC-DC boost converters. A dual loop, discrete, linear feedback was developed to regulate inductor currents and output capacitor voltages. Maximum...
This paper proposes a Simulated Annealing based Global Maximum Power Point Tracking (GMPPT) technique designed for photovoltaic (PV) systems which experience partial shading conditions (PSC). The proposed technique is compared with the common Perturb and Observe MPPT technique and the Particle Swarm Optimization approach to GMPPT. The performance is assessed by considering the time taken to converge...
This paper implemented the single-stage DC generating system fed by simulator of PMSM wind turbine. The simulated wind turbine follows the characteristics of a wind turbine by controlling the torque current and the speed of the PMSM. The single-stage DC generating system is implemented by a two-switch DC-DC converter with a battery. DC generating system regulates the equivalent output load to track...
This paper presents a comparative study among different Maximum Power Point Trackers for Photovoltaic Water Pumping load. Comprehensive analysis and simulation of KC-120-1 PV module (source), Kyocera SD 12–30 solar pump (load) and storage tank (storage) were conducted. Multi-objective optimization based on Genetic Algorithms were performed for two MPPT techniques: perturb and observe (P&O) and...
A modular conversion system has many advantages over a centralized system in a grid-connected photovoltaic (PV) application. Panel-level (micro-inverter) and string-level (string-inverter) extraction of maximum power have been demonstrated to be effective for smaller solar power installations. This paper argues that these strategies, if applied judiciously, will achieve higher power harvesting in...
In the absence of aerodynamic pitch control, it is required to drive the wind turbine at an optimal speed for a given wind speed to extract maximum power from a wind turbine generator system. Due to unpredictable wind speed fluctuations, operating at maximum power point is a difficult task to undertake. This paper presents a maximum power point tracking (MPPT) algorithm for variable speed wind turbines...
This paper presents a novel robust maximum power point tracking (MPPT) control for a grid connected photovoltaic (PV) system with reduced DC link capacitance. The voltage source inverter (VSI) integrating the PV system to the grid introduces a double line frequency ripple or current variation into the PV system. This ripple or current variation results in oscillation of operating point around the...
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