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In the recent years, model predictive control has been consolidated as a design strategy and an attractive alternative for the control of power electronic devices. This paper proposes an active and reactive power control strategy based on predictive control approach applied to grid-connected renewable energy systems. To accomplish this, a three-phase two-level voltage source inverter based topology...
This paper is focused on the performance improvement of the active power factor correctors. Generally, the PFCs are designed as a single boost topology. The main disadvantages of the solution are correction performance at light load, and troublesome heat losses dissipation. The multiphase correctors solve both of these problems. The interleaved correctors enable thermally efficient cooling due to...
In this paper, a novel doubly magnetic geared permanent magnet (DMG-PM) machine is proposed. Through numerical finite element analysis, it is found that the torque transmission capability of the DMG-PM machine is ∼24% higher than its regular counterparts, while the PM usage remains the same. Moreover, the back-EMF is enlarged significantly by ∼37%. In addition, the power factor of the proposed machine...
This paper proposes an algorithm to build a dynamic data matrix (DDM) that allows organizing the topology information of a radial distribution system (RDS). The DDM is then used in load flow analysis of RDSs with and without distributed generation (DG). The deterministic equations of the load flow method and the iterative loop to find the bus voltage magnitude and phase angle solutions of an RDS are...
The usually bulky, heavy and expensive DC-link capacitors create barrier to increasing power density and reliability of energy conversion system in electric-powered vehicles. This paper proposes an online PWM coordination strategy to reduce the ripple current stress of the DC-link capacitors between the cascaded converter and inverter stages. The efficacy of the proposed strategy is substantiated...
Now a day's, renewable energy sources become a substitute source of energy to reduce environment pollution and meet future energy demand. But integration of renewable energy sources to utility grid is a critical process as far as stability and power quality of the system is concerned. For proper synchronization current controlled Pulse width modulated voltage source inverter are generally used. The...
As the most important part of static synchronous generator (STATCOM), cascade valve group should be carried on the strict test, if the reliability of the device is high requirement. This paper presents a suitable control strategy for cascade valve group, and introduces the micro-grid islanding control. V/ƒ control is used as a modulation signal of link, it can provide the necessary support for system...
In this paper, a centralised control framework is introduced for day-ahead operational planning of active distribution networks which accommodate high levels of distributed generation resources. The purpose of the framework is to plan network operation in order to minimise power curtailment from distributed generation and maintaining acceptable levels of voltage regulation throughout the network....
The paper illustrates the development and the implementation of a Distribution State Estimation (DSE) algorithm for the Low Voltage Test Facility with Distributed Energy Resources of the Italian Research center RSE. The algorithm is integrated into a Distribution Management System within the control system of the Test Site organized as a microgrid. The Test Facility is equipped with conventional and...
With the moving of distribution systems towards a renewed architecture, new monitoring and control functionalities have emerged; with them a large amount of information need to be treated. Not all this information is strictly necessary; a relevant part of it can be simplified by the concept of Load Area: a group of prosumers whose power injection has a similar impact on the distribution grid operating...
The drop of prices of photovoltaic technology has attracted investors to develop medium and large scale photovoltaic power plants (PVPPs). Because of the extent of land occupied by these PVPPs, the solar radiation along the plant is different. This situation causes several problems into the grid. Thus, the objective of this paper is to analyse the effect of a 6 MW PVPP at the point of common coupling...
Integration of power due to distributed renewable energy resources (DRERs) with the existing grid to supply electricity to both industrial and residential users is expected to have a significant impact on the future power system. Power electronic transformer (PET) has emerged as one amongst the promising technologies to achieve such requirement. In this paper, a multi-source fed power electronic transformer...
The current from an electrical arc furnace (EAF) in a steel plant is highly unsymmetrical, i.e. it comprises a large amount of negative sequence. This causes problems with the voltage stability in the capacitor submodules for a static synchronous compensator (STATCOM), when implemented using the modular multilevel converter (M2C) concept. In order to counteract the uncontrollability of the capacitor...
Light emitting diodes (LEDs) have great potential to replace existing light sources, like incandescent and fluorescent lamps due to their long life time and higher efficacy. Therefore, also the life time and efficiency of the LED-ballast are important in order to improve the overall system. In addition, size and costs are relevant factors in the highly competitive LED market. The paper compares three...
Modular multilevel topologies are possible candidates for medium-voltage wind turbines because of their scalability and possible redundancy. This paper concentrates on their design and investigates the influence of generator-to-grid voltage ratio, generator nominal frequency, module-capacitance minimising control approaches, third harmonic injection and fault ride-through capability requirement on...
This paper investigates a nine-switch converter topology for STATCOM (Static Synchronous Compensator) application as well as the developed controller and the modulation strategy. The focus of the paper is to study the grid code compliance of a wind farm integrated into the grid while using the aforementioned converter topology. A numerical example is also given so as to examine the dynamic range of...
In order to stabilize the grid frequency in case of sudden loss of power generation, an injection of real power is needed. For this, a Static Var Compensator (SVC) can be combined with ultracapacitors, forming a grid frequency stabilizer. To prove the feasibility of this novel combination, the paper shows the realization of a 1 MW class test rig for full-size modules. Single modules are tested using...
A single phase new type AC-DC converter based on SEPIC topology has been proposed in this paper which has power factor correction and input current shaping facilities. The proposed rectifier is input switched and utilizes a bidirectional switch at the input. The rectifier gives buck-boost voltage gain without polarity reversal. The design has been made separately to operate the rectifier as a buck...
The analysis of an isolated single-stage three-phase ac-dc converter with high power factor, based on the modularity of dc-dc SEPIC converters operating in discontinuous conduction mode is presented in this paper. The ac input is star-connected while the output of the modules are series connected. Doing so, the converter can provide a high step-up ratio and, consequently, besides high output voltage,...
A new current-fed topology for wireless inductive power transfer (IPT) application using half-bridge circuit is proposed and analyzed. Conventional IPT circuits employ parallel L-C resonant tank/compensation network to transfer power effectively through air-gap. However, in medium power application, this topology suffers from a major drawback that the voltage stress across the inverter switches are...
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