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In this paper a zero-voltage transition low current ripple fifth-order boost converter is proposed which offers significant advantages over conventional second-order boost converter. The fifth-order converter provides higher voltage level at lower duty ratios and the ripple at input and output is also reduced. The zero-voltage transition cell which is also incorporated into the circuit provides further...
This paper concentrates on the control of power flow in single stage photovoltaic energy conversion system. The conversion structure has a twofold requirement that consists in ensuring that the current injected to both load and grid obeys to the grid connection standards and sets the DC bus voltage similar to the reference voltage given by the MPPT algorithm. The advanced functions that can be added...
This paper deals with the study and simulation of photovoltaic (PV) inverter for stand-alone applications. The system is composed of a PV array feeding RL load through a dc-dc boost converter and three-phase inverter. To assess the system performance, simulations based on hybrid co-simulation approach are performed. At the outset, the PV model is elaborated using Pspice, verified and compared with...
This paper presents an active power filter with direct output voltage control function of single-phase AC-DC converter. This configuration is capable to improve power-factor and also to reduce total harmonic distortion (THD) of line current. Apart of improving power quality of line current waveform, this approach allows output DC voltage control without any additional regulation circuits to regulate...
In the recent past, there has been an exponential increase in data intensive services over the communication networks. This trend would sustain in future communication networks as well, especially in the Wi-Fi networks. This could be attributed to rapid growth of business and institutional entities and the need for cellular data off-loading for which localized Wi-Fi networks are preferred due to higher...
In this paper, a new arrangement of seven-level Stepped DC Link Inverter (SDCLI) is proposed. It consists of DC link modules and H-bridge inverter. Compared with Two-Level Inverter (TLI), the SDCLI system generates the output voltage with reduced harmonic content and voltage stress. SDCLI can considerably reduce the switch count as well as gate drivers as the number of voltage levels increases. The...
This paper presents a control method for a boost converter, which is connected to a dc-link of an onboard microgrid system via an LC input filter. The boost converter is considered as a load converter. This control approach is based on a Lyapunov stability analysis, where all state variables must be known. An observer is used to estimate the input current and losses in the converter. A change of load...
This paper presents the modeling of linear-assisted DC-DC regulators. This kind of voltage regulators consists of a switching converter together with a classic or LDO (low dropout) linear voltage regulator. While the linear regulator provides the constant output voltage, the switching converter conducts nearly all the current provided in the output load, and keeping the regulator current close to...
In this paper, the dynamics of the half-bridge LLC resonant converter are investigated based on the small signal model and a piecewise PI regulation is studied and derived by simulation. Small-signal dynamics of the circuit under consideration contain many factors that may affect regulation accuracy and performance of digitally controlled regulators. The load factor is specifically addressed here...
This paper summarizes simulation based technical feasibility and cost benefit analyses of a range of off-the-shelf electrical losses reduction intervention solutions in the Isle of Wight (IoW) 11 kV distribution network in the United Kingdom (UK), assessed over a period of 45 years. Based on presented results, the paper provides a brief commentary on the merits, drawbacks, risks and recommendations...
The paper presents a novel control strategy for modifying the system demand by applying an ON/OFF signal to the control loads, for maintaining supply-demand balance. The strategy involves employing Cooperative Home Energy Management Systems (CoHEM) at distribution transformers, acting as a bridge between utility and customers and exploiting the benefits of both centralized and decentralized control...
Soft Open Point (SOP) refers to a novel power electronic device installed in distribution system to replace the traditional tie switch. The application of SOP will promote the flexibility and resilience of the distribution system. Under a fault condition, SOP enables to provide voltage support and helps to expand the scope of power supply for the supply restoration. In this paper, a supply restoration...
From the viewpoint of the emerging concept of smart grid, distribution network will require fast power flow solution that must be resolved as efficiently as possible. Presence of distributed generators and power electronic based compensating devices, in modern medium and low voltage distribution networks, additionaly expands requirements for performances of algorithms for power flow calculations which...
In this paper, the design of a linear quadratic regulator (LQR) controller for the DC-DC stage of a Solid State Transformer (SST) based on a quad-active-bridge (QAB) to integrate both photovoltaic (PV) power generation and battery energy storage is presented. The gyrator-based average model is used for deriving the state-space representation of the plant. The dynamic performance of the designed controller...
The distribution system operation in Beijing, China, is investigating on an AC/DC topology for expanding a local distribution system. The feature is to install multi-terminal DC interconnections (MTDI) among three substations, in order to achieve un-interrupted load transfer as well as better loading sharing during primary transformer N-1 outages. This paper presents a reliability assessment of hybrid...
This article presents a study of a design of four controllers to a ladder converter modeled by the generalized equivalent continuous model. Two controllers are designed minimizing the energy of the input and minimizing the states; and the other two controllers are designed minimizing the changes in the input, and the states. Also, the article shows a Kalman filter with shaping noise filter to estimate...
Distribution Fault outage directly influences the normal electricity consumption. Accurate evaluation of distribution fault outage cost plays a key role in the investment and decision on improving the power supply reliability. Based on distribution topology, we first analyze the characteristics of distribution load when take distributed photovoltaic generation (DPG) into accounts and propose the practical...
SDN (Software Defined Network) is the important part of Future Network, and the OpenFlow soft switch which separates the control plane from the data plane is the key instrument. In this paper, the OpenFlow switch are analyzed, the main performance parameters are throughput, packet loss and time-delay, the influence factors are load, packet size and the transforming packet quantity. Kernel Partial...
During the modelling of technical systems, the developer of the model is always faced with uncertain quantities due to non-ideal measurement devices. In contrast to classical stochastical approaches to handle these uncertainties, guaranteed approaches represent an emerging alternative. They allow on the one hand a direct application of the usually given error bounds of measurements and on the other...
The use of a model predictive control algorithm to reduce the losses in a 3L-NPC inverter with SiC neutral point diodes was investigated. It considers the reduced switching losses associated with the commutations that involve a SiC diode. A loss reduction of 5% is achieved compared to a standard sine-triangle modulation.
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