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This paper approaches the topic of robust control for DC-DC power converters. A low-power single-ended primary-inductor converter (SEPIC) has been chosen as a case study, for which the output voltage regulation problem in presence of parameter uncertainties is stated in the Hinf formalism as a disturbance-rejection problem. This approach is assessed by numerical simulations in MATLAB against a classical...
The future all-electric warship is expected to utilize medium-voltage DC (MVDC) main distribution to supply several load zones. The load zones will convert the MVDC power to lower voltage for use by local loads as well as contain local energy storage for casualty back-up power. A majority, if not totality, of loads are expected to exhibit constant-power load (CPL) behavior. While many papers have...
This paper presents modeling and study of a boost DC-DC converter with guaranteed output parameters. The developed models of the power and control circuits are detailed [1]. The models are synthesized in MATLAB environment. The behavior and mutual influence on the operation of both the power circuit and the control system are examined. Control algorithms for various types of loads are proposed and...
The US Navy is pursuing development of all-electric warships. The future all-electric warship is expected to utilize medium-voltage DC (MVDC) main distribution to supply several load zones. The load zones will convert the MVDC power to lower voltage for use by local loads as well as contain local energy storage for casualty back-up power. A majority, if not totality of loads are expected to exhibit...
The focal point of this paper is to design and implement a Dc-Dc boost converter based on fixed frequency sliding mode control in continuous conduction mode for hybrid vehicles. The equivalent control based sliding mode controller operated at fixed frequency is designed by keeping in view the stability of the sliding surface. Matlab / Simulink is used to model and evaluate the design of the equivalent...
Hybridization of energy sources gives better reliability and flexibility for the power generation system. For integrating different sources, a suitable power electronic interface and a power management strategy are mandatory requirements. In this paper, implementation of closed loop controller for a dual input single output DC-DC converter to integrate two different VI characteristic sources for DC...
Photovoltaic (PV) module mismatching and non-uniform insolation conditions are the major drawbacks of the PV systems. The distributed maximum power point tracking (DMPPT) method is an effective solution to mitigate these drawbacks but, the DMPPT with conventional algorithms requires more sensors to implement. A single output voltage sensor based DMPPT algorithm with parallel configuration is presented...
In this paper, a new robust sliding mode current controller is proposed for fourth order dc-dc converters in continuous conduction mode. The main purpose of controller is to regulate output voltage under load and input voltage variations. Advantage of proposed sliding surface is that it needs only one current sensor to sense inductor current. Converters included in this paper are zeta, cuk and single-ended...
A maximum power point tracking (MPPT) scheme based on a power factor correction (PFC) strategy that uses a multiplier approach is presented. The purpose is that the switching converter behaves as a resistor seen by the photovoltaic module, and thus regulate the input voltage to a desired value. Moreover the multiplier approach considers an inner current loop and an outer voltage loop. In order to...
ADC microgrid system made up of the utility grid, solar PV, electric double layer capacitor (EDLC), and loads is proposed and a three pole DC distribution line is adopted. A novel, two-phase interleaved boost converter having reduced size of filter (capacitor), with a compensator for better voltage regulation is introduced. This is better suitable for a DC microgrid to coalesce solar photovoltaic...
Integrated gate-drivers for power MOSFETs require multiple supply voltages biasing internal circuitry or providing a high voltage ground to the high-side driver. This paper proposes a novel DC-DC converter architecture fulfilling these demands of modern gate-driver ASICs while increasing system efficiency. In the proposed concept a conventional single inductor DC-DC converter generating a low voltage...
To interface low-voltage dc-output power sources to ac grid, the split dc-bus dc-ac inverters driven by step-up isolated dual-output dc-dc converters can be a solution. When the split dc-bus dc-ac inverter is loaded with single-phase ac or unbalanced three-phase ac, current ripples will propagate through the dc-dc converters at frequencies that are related to the ac side fundamental. For the dc-dc...
This paper focuses on the circulating current between parallel dc-dc converters of dc microgrids, and the impacts of droop coefficient on load sharing and bus voltage are analyzed. The form of variable droop coefficient and dynamic voltage compensation method is proposed based on the analysis results to adapt to various situations and steady bus voltage. This method is simple and effective, and it...
Buck converters are still used as an efficient step down DC-DC converters for constant load voltage for many power supply applications under variable input voltage and different loading conditions. In most of the applications DC-DC converters are controlled by either voltage or by current mode controller. DC-DC converters exhibit non-linear behavior due to switching, hence controller design comes...
This paper deals with a master-slave control strategy for a ISOP (input-series and output-parallel) connected full-bridge DC-DC converter system, and each separate module is controlled by phase-shift control method. The master module regulates the output voltage of the whole system, and overcomes the problem of narrow range of output voltage regulation. The slave module balances input voltages between...
This paper deals with controlling DC-DC boost converter by average sliding controller (ASC) cascaded with PI voltage controller. In the study after modeling of circuit configuration, the cascaded PI-ASC controller is applied to the DC-DC Boost converter. The output value of PI voltage controller is used as a reference current value for ASC which is used for current controller. The topology is modeled...
This paper presents an extension to the switched capacitor DC-DC converter model when supplying loads stacked vertically. Stacking loads vertically drastically reduces the required size of a DC-DC converter, as it only needs to supply the mismatch current between the loads. Furthermore, when loads are perfectly matched, efficiency is only limited by the power consumption of the control loop, achieving...
The following closed-loop transfer functions of the boost converter operating in continuous-conduction mode (CCM) supplying a complex impedance load are derived and analyzed: input-to-output voltage Mvcl and reference-to-output Tcl. The load of the boost dc-dc converter is composed of a series-connected resistance and inductance. The dynamic characteristics of the closed-loop boost converter with...
The stability of dc microgrids is influenced by the nonlinear behavior of the converter-controlled loads with constant power characteristics. This nonlinear dynamic, in line with reduced size input filters used in the embedded power distribution of transportation systems, has a degrading effect on the dynamic performance and stability of the system. This paper presents the complete stability analysis...
Microgrid allows flexible integration of distributed generation using renewable energy sources into the conventional centralized power system with the additional benefit of islanded mode operation Research efforts on DC microgrids have gained momentum in the recent years, mainly due to its inherent advantages compared to AC microgrids. Several DC renewable energy sources are connected to a common...
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