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A voltage mode transmitter that detects data transitions and enables a high frequency boost for the output signal is presented. The transmitter utilizes a passive high pass filter to detect input data transitions and increase the output amplitude by turning on additional NMOS and PMOS transistors only when the data is changing. In HSPICE simulations, the transmitter is capable of equalizing a 20 Gbps...
The analysis of unintentional islanding in distribution grids with a large penetration of renewable energy sources is of increasing interest due to the recently introduced requirements of P/f and Q/V supporting capabilities of Distributed Energy Resources (DERs) and the wider frequency and voltage ranges, DERs should be able to operate with, before protection tripping. DER anti-islanding protections,...
This paper proposes a fuzzy adaptive P&O controller for photovoltaic generation in AC systems. The goal of this controller is to overcome the MPPT accuracy of the classic P&O, which is impaired by the fixed step-size of the duty-cycle variation. Therefore, the fuzzy adaptive P&O controller varies the duty-cycle step-size to achieve fast dynamic response and accurate MPPT with reduced oscillation...
In this paper, a simple single-phase grid-connected photovoltaic (PV) inverter topology consisting of a three-level inverter, an LCL filter, and a new current feedback method for active damping is considered. A dynamically rapid method is used for tracking the maximum power point (MPP) of photovoltaic arrays, known as ripple correlation control. The algorithm uses the current and voltage low-frequency...
This paper presents the options for determining power losses in the system consisting of indirect frequency converter and induction machine. A mathematical model for calculation of individual losses in machine as well as in converter is presented herein. The model allows the determination of losses both in steady states and in the course of transients, e.g. starting, braking, load change. The model...
The direct torque and stator flux control (DTFC) for PMSM drives has been used as in many applications [1]-[3]. In traditional DTFC system, the stator flux linkage is estimated by integrating the induced voltage vector. The stator voltage vectors could either be measured by sensor or re-constructed using inverter switching status and the DC bus voltage. However, the measurements of voltage pulse trains...
This paper presents a start-up circuit based upon output voltage feedback for thermal energy harvesting. The feedback loop consisting of an output load, a boost converter core, a charge-pump-based doubler and a CMOS inverter switch to track the output voltage and generate a reset signal to kickstart the boost converter. The proposed start-up circuit shows a remarkably improved start-up time of 35μs...
Multi-megawatt photovoltaic (PV) power plants are widespread in electrical power systems because of the drastic decrease in the PV panel prices. The multi-string structure is considered for high power PV systems due to the increase in the overall energy conversion efficiency and the modularity when compared to the centralized topology. High power conversion can be achieved easily using parallel connection...
Multi-megawatt photovoltaic (PV) power plants are widespread in electrical power systems because of the drastic decrease in the PV panel prices. The multi-string structure is considered for high power PV systems due to the increase in the overall energy conversion efficiency and the modularity when compared to the centralized topology. High power conversion can be achieved easily using parallel connection...
Grid-connected photovoltaic (PV) systems with relatively high capacity effectively reduce peak load, but because of their reverse power flow, they can cause overvoltage along a feeder that can exceed five percent of the rated voltage. Modern PV systems with the capability of Volt/Var control can mitigate overvoltage by either injecting or absorbing reactive power. Thus, the objectives of this study...
A microgrid (MG) as a main component of the smart grid integrates Distributed Generation System (DGS) to supply power of local loads. In other words, MG is a unit of integration of the DGs and loads which can operate either connected to or isolated from the main grid. Coordinated control of DGs in MGs is one of the technical difficulties. In this paper, a typical MG consisting of three DGs which are...
In this paper, a novel two - stage cascaded Interleaved Boost Converter is proposed. A steady state mathematical model for the same has been developed on MATLAB / SIMULINK. This converter provides a high voltage output which is intended to power a three - phase inverter which subsequently drives a three - phase AC load. The input considered is from a 48V battery or solar panel. The output DC link...
The well known advantages from PV based power generation (PVPG) are pollution free, short-term installation and long life operation. However, disadvantages are also associated, for e.g. dependency of generated power on weather conditions, and researchers are putting efforts to overcome them by application of power electronic based devices and techniques like maximum power point (MPPT) in the systems...
This paper proposes a method for independent drive of two permanent magnet synchronous motors (PMSMs) fed by a single five-leg inverter (5LI) based on reducing peak current of common leg. The advantages of 5LI are reduced size, volume, reduced number of devices, and increased efficiency due to total lower losses. The conventional method that has been used for controlling two PMSMs sends a large amount...
This paper aims to analyze the applied hybrid controlled three-phase grid-connected inverter for marine current power generation system used in distributed generation. As inverter is a key part of the grid-based system, grid-connected technology plays an important role in the distributed generation to meet the stricter grid interconnection standards. In order to improve the power quality and strengthen...
Multilevel converters are now popular power electronic converters for medium-voltage high power drives. The switching losses dominate in the high power drives and hence, low device switching frequencies are preferred to improve the overall efficiency of drive system. However, low device switching frequencies leads to increase in total harmonic distortion (THD) of stator currents. One emerging technique...
This paper presents modified topologies for the Z-source inverter. The main objective of the modifications are to get higher boost factor, less voltage stress across the switches as well as reduction of the number of passive components. Two types of inverter topologies are presented in this paper. They are ripple-input current proposed inverter (r-proposed inverter) and continuous-input current proposed...
This paper describes a control method for the self-sustained operation of a photovoltaic (PV) generation system to compensate the output voltage distortion compensation. In order to improve the output voltage distortion, the control circuit consists of sinusoidal tracking control based on the internal model principle. Moreover, the control system is configured by combining the sinusoidal tracking...
A double-band hysteresis current-control (DBHCC) strategy for single-phase UPS inverters with the use of proportional resonant (PR) controller is introduced. The PR controller eliminates the steady-state error in the output voltage. The output of PR controller serves as reference inductor current which is compared with the measured inductor current. The current error is then fed to the DBHCC block...
This paper proposes a numerical algorithm for drawing distribution maps of switching power-converter characteristics on parameter spaces. The concept of the proposed algorithm is that parameters satisfying the assigned conditions are derived and followed with low computation cost. Zero-Voltage-Switching (ZVS) region, output power distribution map, and contour map of power-conversion efficiency of...
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