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This paper proposes a standstill test method for the determination of electrical parameters of permanent magnet synchronous machine (PMSM) drive system fed by a conventional three-leg inverter. In order to estimate the equivalent total circuit resistance, a self-cancellation method is proposed to eliminate the influence of inverter nonlinearity on the calculation. With the identified equivalent total...
This work presents the design and the realization of an autonomous small scale brackish water reverse osmosis desalination unit powered by intermittent renewable energy source. Sizing of motor-pumps, desalination membrane, renewable energy source and measuring instruments is detailed and analyzed. Motor-pumps characterization allowed to study their performances for several operating points according...
Islanding is a condition in which the distributed generation along with the local load starts operating independently when isolated from rest of the power system. Because of the adverse effect of island operation, islanding detection is a necessary requirement in distributed generation system and it must be detected accurately and quickly. In present scenario of power system, loads can be balanced,...
In modern power systems and especially in autonomous distributed generation (DG), the frequency and voltage regulation should be continuously controlled. Hence the analysis of such a DG system is essential for the reliable operation of the local grid, with the voltage source inverter to play a key role as a controlled interface between the energy sources and the loads. In this frame, the complete...
In a distribution network with the presence of PV systems, islanding phenomena can occur. Such isolated islands may cause a serious danger for workers and equipment. Therefore, islanding must be detected and the islanded PV systems must be disconnected from the principal network. This paper gives a review of different islanding detection methods for grid-connected PV inverters. These methods can be...
The buck-boost inverter can be easily used to construct a multi-input converter due to its inherent symmetrical and extendable differential structure. This paper proposed a multi-input converter derived from the buck-boost inverter to interface different input sources. When two pure DC voltages are chosen as the references for the two output capacitor voltages, the proposed converter will operate...
Energy storage in the form of electrolytic Hydrogen can play an important role for integration of intermittent renewable energy sources in the smart grid environment. Electrolytic Hydrogen can be used as a fuel in proton exchange membrane (PEM) fuel cell. In this work, a technique for multiphase switching of a DC-DC converter associated with grid integration of a PEM fuel cell stack for maximum power...
Printed electronics (PE) on flexible substrates is a promising technology for wearables and internet of things (IoT). To implement an integrated system on flexible substrates for applications ranging from medical imaging to disposable thermometers, robust design methodology based on unreliable printed components plays a critical role. This paper reviews robust design of printed circuits based on thin-film...
Current controlled inverters need to be dynamic and robust even under grid disturbances and different grid faults. Besides a robust control method the requirements for synchronization of the system become more and more important especially when multilevel inverter topologies are used. The combination of direct current control methods and advanced grid synchronization techniques promise excellent working...
In this contribution, the switching frequency based active power will be presented as a new power definition. It combines the information of the instantaneous power, as product of voltage and current, and the conventional active power representing the mean value of the instantaneous power over the fundamental period. Under several theoretical conditions the switching frequency based active power is...
This paper presents the control method of an LCL filter implemented for a three-phase, voltage-source, grid-connected inverter for not only offering better attenuation of switching harmonics but also for highly damping the resonance. A discrete-time deadbeat current controller with tuned state-feedback gains is proposed to realize the time optimum responses with high control accuracy. In addition,...
This paper introduces usage of Volt-sec. sensing in back-EMF-based self-sensing (sensorless) induction machine drives. In practice, both inverter nonlinearity and dc bus voltage affect back-EMF estimation accuracy, and therefore self-sensing performance. A real-time Volt-sec. sensing scheme to measure the terminal Volt-sec. vector for each switching period is introduced in the paper. The measured...
This paper presents a direct model predictive control (MPC) strategy for the quasi-Z-source inverter connected to a linear/nonlinear load via an intermediate LC filter. The proposed scheme simultaneously controls the ac-side output voltage and the dc-side capacitor voltage and inductor current. The discrete-time model of the converter is derived which can be used for both modes of operations, namely...
The expected development of grid monitoring applications and control functionalities in low voltage distribution networks calls for advanced simulation tools for performance assessment of these applications. Power hardware-in-the-loop simulations form a cost effective approach to accurately capture the (dynamic) system behaviour. This paper describes the development of a data acquisition and processing...
In this paper, we present a method for distributing controller gains to assets offering local volt/var control. Gains are distributed based on a fairness principle, where all assets contribute equally to the voltage control, eliminating effects such as physical location. The method relays on a limited need for communication, and is inherently robust against connection loss, since only gains are updated...
Power hardware-in-the-loop (PHIL) simulation, where actual hardware under text is coupled with a real-time digital model in closed loop, is a powerful tool for analyzing new methods of control for emerging distributed power systems. However, without careful design and compensation of the interface between the simulated and actual systems, PHIL simulations may exhibit instability and modeling inaccuracies...
A central control algorithm was developed to utilize photovoltaic system advanced inverter functions, specifically fixed power factor and constant reactive power, to provide distribution system voltage regulation and to mitigate voltage regulator tap operations by using voltage measurements at the regulator. As with any centralized control strategy, the capabilities of the control require a reliable...
This paper outlines a data-driven, distributionally robust approach to solve chance-constrained AC optimal power flow problems in distribution networks. Uncertain forecasts for loads and power generated by photovoltaic (PV) systems are considered, with the goal of minimizing PV curtailment while meeting power flow and voltage regulation constraints. A data-driven approach is utilized to develop a...
This paper proposes a frequency domain model to predict conducted electromagnetic interferences (EMI) caused by a converter. In the model, the nonlinear and time-variant semiconductor switches of the converter are replaced by voltage sources characterized by measurements during operation of the converter. A vector network analyzer (VNA) measurement method is presented to characterize the disturbance...
Increases in penetration of small-scale, consumer-owned photovoltaic (PV) systems in the distribution grid has given rise to increased problems with voltage regulation, particularly in the cases of mid-day operation, where low load coincides with high PV production, and partially cloudy conditions, where PV production can vary rapidly. Much research has been conducted into solving the voltage regulation...
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