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A series-series compensated circuit of the wireless power transmission system has characteristics of increasing charging power during coil misalignment. In order to limit the increasing charging power and to meet the capacity of onboard power converter, this study proposes a constant voltage control with power reference method. The charging power is controlled by adjusting duty ratio of the onboard...
This paper develops selective strategies for Neutral Point Clamped Multilevel Inverter (NPC) in a microgrid application with load current decomposition based on Synchronous Reference Frame (DQ) method. The 3-level NPC inverter is investigated as widely used topology for medium and high power applications. In addition to the current injection into the grid, the 3-level NPC DG inverter is also being...
Bidirectional contactless grid interfaces are gaining popularity as an alternative to conventional hardwired interfaces in vehicle-to-grid (V2G) and grid-to-vehicle (G2V) applications. However, such systems typically employ a large input inductor as well as a large and expensive electrolytic DC-link capacitor, which compromises the reliability of the entire system. Although, back-to-back converter...
A novel single-phase current fed full-bridge converter with split DC output voltage, multifunctional input source (main grid, photovoltaic modules or battery bank), power factor correction for main grid applications and high-frequency transformer (HFT) isolation topology is presented in this paper. This converter might be a suitable alternative when used as an input stage of uninterruptible power...
In this paper, we present our research, development about knowledge-based ontology in “Electrical engineering” region. As a means of formal descriptions of the subject area are considered, ontology is a set of terms and associated definitions that are related to some subject regions and performing the function. Protégé program is used to present ontologies in “electrical engineering” region. The results...
FACTS devices are used to control the voltage profile and stability of power system by improving transient and dynamic stability. Particle swarm optimization (PSO) technique is used in place of Genetic Algorithm (GA) for minimization of losses and simulation process. There are several types of FACTS devices but we have discussed only SVC (Static Var Compensator), Thyristor Controlled Series Compensator...
The loss reduction algorithm for the light-load is needed to increase overall efficiency. The inductor current ripple is the fixed magnitude, and it generates almost loss of the total losses at the light-load. Therefore, the ripple current reduction algorithm is efficient method to increase the light-load efficiency. This letter proposes the control algorithm to increase light-load efficiency by controlling...
According to different operating modes of microgrid, different control strategies for energy storage system are presented. When microgrid parallels in the grid, the bus voltage of microgrid was supported by grid, and the energy storage system serves as the PQ source, using PQ control strategy; When microgrid is off-grid, the energy storage system serves as the main power supply of microgrid, using...
In this paper the control problem of a nonlinear chemical reactor using a free offset state feedback controller using linear matrix inequalities (LMI) is presented. The performance of the control system is verified throughout the operating range by numerical simulations. A performance comparison between the control system with a controller adjusted based on a nominal model and other with a robust...
Three-phase interleaved boost converter with voltage multiplier has higher voltage gain, lower input current ripple and output voltage ripple compared with legacy boost converter. In addition, the voltage stress on switches of the converter is only half of the output voltage. However, the converter will have a higher voltage stress on the switches if it operates in light load. A novel PWM control...
This paper presents a novel, non-isolated step-down converter for the application of point-of-load (POL) voltage regulation. The new converter can achieve higher power density by utilizing a much smaller inductor compared with Buck converter in the POL application. A smaller inductor is achieved by increasing the effective operating frequency applied to the inductor by a factor of 4 and at the same...
Dissolved Oxygen (DO) concentration is a crucial parameter for efficient operation of biological processes taking place in the activated sludge Wastewater Treatment Plant (WWTP). High-quality DO control is difficult to achieve because of complex nonlinear behavior of the plant and substantial influent disturbances. A method to improve the Direct Model Reference Adaptive Control (DMRAC) technology...
This paper designs a control system for an automatic handling mobile robot based on s3c2440, which can recognize environment by a laser sensor. And according to the fact that the accumulative error will increase with time in inertial navigation system and steering control is easy to be out of control for heavy robot using differential steering mechanism, two effective solutions are proposed. An inertial...
The PI algorithm has proven to be a popular and widely used control method, due to its relative simplicity and robustness. Despite this, the linear nature of the algorithm means it doesn't provide optimal control to non-linear systems. This paper presents a novel method of improving the performance of the PI controller using an ANFIS network to provide gain scheduling. This control scheme is applied...
In this paper, a new dual-input-dual-output (DIDO) dc-dc converter is proposed to interface solar PV and fuel cell (FC) sources to a low-voltage dc microgrid. This non-isolated converter topology is efficient, compact and has fewer circuit components with only one inductor compared to the conventional non-isolated dc-dc converters. The proposed topology is suitable for a low-voltage bipolar type dc-microgrid...
This paper presents a 3.2nW quiescent power solar energy harvesting system. The control circuit is designed in an asynchronous fashion that scales the effective switching frequency of the converter with the level of the power transferred. The on-time of the converter switches adapts dynamically to the input and output voltages for peak-current control and zero-current switching. The chip integrates...
The use of high-frequency PWM converters for laser diodes operating in a pulse mode is a prospective direction. High demands are made to the quality of pump current pulses. In this paper the dual-channel step-down DC/DC converter is considered as a pulse shaper. In addition, the converter control method is proposed. This method allows to set phases of the control signals quickly and without changing...
The capacitor voltage feedback active damping control is an attractive way to suppress LCL-filter resonance especially for the systems where the capacitor voltage is used for grid synchronization, since no extra sensors are added. The derivative is the core of the capacitor voltage feedback active damping control. However, in digital systems, the discrete implementation of the derivative suffers from...
The main theme of this paper is to propose a novel peak current mode control method to reduce the loss of phase-shifted full-bridge (PSFB) converter under light load condition. The proposed control method can adjust the switching frequency of the converter to keep the on-time of switches fixed. According to the loss analysis model in discontinuous current mode operation, the switching frequency is...
A small signal analysis and a closed loop control design of naturally commutated current-fed three-phase isolated dc/dc converter are presented in this paper. State-space averaging technique is used to derive the small signal model. Based on the derived small signal model, a closed two-loop controller is designed and implemented on mixed signal (analog and digital) processor Cypress PSoC 5. A complete...
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