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In DC microgrids, constant power loads (CPLs) would lead to a destabilizing effect that may cause the main bus voltage oscillation. Hence, most researcher are exploring the stabilization methods for DC/DC buck converters feeding CPLs. In practical applications, buck converters are always cascaded with LC input filters to prevent the switching harmonics from returning into the source. With the addition...
This paper proposes a novel distributed control scheme for DC microgrids to acquire minimum generation cost and recover the global average voltage with consideration of capacity constraints. Our main focus is on constrained problems where the power of each distributed generator (DG) is restricted to lie in the feasible region. In this paper, a global load observer (GLO) is introduced that uses neighbor's...
In this paper, the relationship between real and reactive power sharing in islanded microgrid considering the complex impedance effect is analyzed. It is determined that traditional droop control has drawbacks in achieving accurate power sharing caused by the mismatched feeder line effect. In order to enhance the power sharing accuracy, an adaptive droop control using virtual impedance for islanded...
Series DC electric springs (series ESs) can be a cost-effective technology to tackle the intermittency of the renewable generations in DC distribution grids. When multiple series ESs are connected to differently rated non-critical loads (NCLs) and are operated to regulate the voltages at their respective points of common coupling, the charging and discharging characteristics among the ESs are different...
In the integration of photovoltaics (PV) with the power grids, battery energy storage systems (BESS) are often adopted to buffer the intermittent solar power. For the PV-battery combination, the capacity of the BESS increases with the scale of PV integration, which increases the cost. In this paper, a PV-embedded series DC electric spring (PVES), which is a new combination of non-critical load, PV,...
A micro-grid is a group of interconnected loads and energy resources, which can operate in grid connected or island mode. Without frequency control, DC micro-grid makes networking operation easier. A unified communications network is needed to establish for safe and efficient operation of distributed power generation, energy storage devices and the load equipment in the DC micro-grid. By using a communications...
An adaptive controller is designed for three-phase pulse width modulation (PWM) voltage source rectifier with parametric uncertainties based on the dynamic surface control (DSC) technique. The unknown parameters of the system are estimated by applying the adaptive control method. In addition, the problem of “explosion of complexity” in backstepping design procedure is avoided by using the DSC technique...
This paper proposes a new modular multilevel converter based unified power quality controller (MMC-UPQC). As one of the key technologies of MMC-UPQC, the start strategy is discussed and combined with the establishment of the DC side capacitance voltage. In this paper, the main circuit of MMC-UPQC and the operating states of MMC sub-modules (SMs) are described in detail. Two start control strategies...
We present a 1.0Mb pipeline 6T SRAM in 40nm Low-Power CMOS technology. The design employs a variation-tolerant Step-Up Word-Line (SUWL) to improve the Read Static Noise Margin (RSNM) without compromising the Read performance and Write-ability. The Write-ability is further enhanced by an Adaptive Data-Aware Write-Assist (ADAWA) scheme. The 1.0Mb test chip operates from 1.5V to 0.7V, with operating...
The paper presents design, modeling, control and implementation of a ldquolong-pulserdquo three-phase resonant converter. A DQ equivalent circuit model of the resonant tank system is established first. Based on that, a model of the whole power supply and a state space multivariable feedback control has been developed. The soft switching, zero current switching (ZCS), is achieved by combining frequency...
This paper proposes a universal approach (model) to deal with current mode controlled power modules while investigating large-signal interactions among subsystems in a distributed dc power system. By establishing a family of power stage models that embody nonlinearity to an algebraic operation block and keeping all components along in the external feedback control loops staying in simulation, simulation...
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