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This paper proposes a DC-bus signaling (DBS) method for a power management in a DC microgrid. In order to autonomously increase its reliability and response speed. As opposed to a centralized power management system, which needs communication among the power sources and load, the proposed DBS method uses the common DC-bus voltage to determine proper operation and does not require communication. The...
Model Predictive Control (MPC) method offers advantages of easy implementation and fast dynamics. However Model predictive control method has variable switching frequency, which makes design of the output filter difficult for power converter. Despite the problems of MPC algorithm, there are little methods to fix the switching frequency using MPC algorithm in power converter. Therefore, this paper...
This paper is about the design for the control of a cascaded hybrid converter for railway applications. It shows, how to control the converter with considerations of special aspects for the use in rail vehicles. It considers several aspects of reducing THD of the current and reduction of switching losses.
In this paper, a simple voltage balance controller for a SST using cascaded H-bridge rectifiers is proposed to deal with voltage unbalance problem of DC-links. The tolerance of parameters on DC-DC stage, which consists of parallel-connected DAB converters, can cause the unbalance problem of output voltage on H-bridge rectifiers. In order to solve this unbalance problem, an additional voltage balance...
A control system for a DC-DC boost converter based on a deadbeat controller providing a finite duration transient in a small neighborhood of the equilibrium state is proposed. Deadbeat control is implemented by reducing a system matrix to the Frobenius form without transformation of state variables. A procedure to obtain deadbeat controller parameters for DC-DC boost converter is stated. Mathematical...
This paper presents the concept of a compensator of voltage sage/swell installed in connection terminals of small industrial plant or selected loads. This compensator based on a three-phase hybrid transformer with matrix converter. Presented in this paper is an approach for obtaining continuous control of the voltage magnitude and phase shift using a conventional transformer with two windings and...
A circulating current is a major problem introduced by directly connecting voltage source inverter (VSI) in parallel. This circulating current occurs as a zero-sequence current between the inverters by specic switch states. Its alternatives were presented by hardware and software methods in many papers. When coupled inductor (CI) are employed for the high frequency circulating current, a circulating...
Customers may have different power quality requirements, thus, the economic operational strategy can try to provide them with distinctive quality levels as customized service. An optimization based method is proposed in this paper to realize this functionality, offering the possibility that the customers can flexibly set and adjust their requirements. Converter interfaced distributed generators are...
The control of multiterminal HVDC systems based on local variables has shown a better performance, in terms of dynamical response and implementation simplicity, than constant DC voltage and droop control. However, power oscillations can be produced due to the interaction among different HVDC stations. In this paper, a modified control logic for this type of control is proposed in order to reduce the...
This paper proposes a high response voltage phase torque control method of interior permanent magnet synchronous motors for both linear and over-modulation range including six-step mode. In our proposed method, a new n-t coordinate system is utilized, on which voltage phase and amplitude are controlled responsively and stably.
This paper describes a method of deriving frequency characteristics of PMSM current control system based on Model Predictive Control (MPC). MPC controller predicts the current behavior using the mathematical model of PMSM and directly selects the optimal switch state based on evaluation of these predicted results. So, we have focused the possibility of MPC, which makes it possible to drive machines...
This paper is concerned with modification of the One Cycle Controller for DCM Boost high quality rectifier. With the proposed control circuit the boost converter can attain a near unity power factor and near zero total harmonic distortion. This paper presents the theoretical analysis, simulation and experimental results.
A control strategy for bidirectional flow of electromagnetic stirring is proposed. The topology structure of the system includes the forward stage PWM converter and the backward stage two-phase three-leg converter, which both can work in the rectifying and inverting status. So bidirectional energy flow can be realized. The control method for the forward stage is the double loop control with ripple...
This paper introduces a new power factor correction scheme for a flyback converter with primary regulation technique, to ideally eliminate the distortion of the ac input current (practically a Total Harmonic Distortion (THD) lower than 5%). The effectiveness of the new control scheme is proved in a 35W driver with universal input range (90VAC∼277VAC). Application target is Solid State Lighting (LED...
Harmonic power sharing and PCC voltage quality are both important issues for the power quality of islanded microgrids. This paper proposes a new control scheme to deal with those two issues based on controlling the equivalent harmonic impedance of DGs. With the proposed control scheme, harmonic power is shared according to remaining power capacities of DGs and PCC voltage harmonics are effectively...
A circuit topology and its control for a bi-directional isolated series resonant converter (SRC) are proposed. In general SRCs, when the output voltage is decreased, the turn-off current and the switching frequency are increased and efficiency is decreased due to the increase of switching loss. MOSFETs are therefore mainly used, as MOSFETs have a lower turn-off loss than IGBTs. In the present study,...
A methodology for lifetime testing of lithium-ion batteries in small SOC intervals is presented. The specific test procedure and level of control is important in producing reliable data. The methodology offers high precision without increasing the test duration. The duration time can be reduced with up to 50%, by ensuring more continuous cycling and by reducing the number of performance tests.
One of the important role for dc-dc converters is to regulate output voltage against the transient variation of input voltage. Recently, renewable energy becomes popular and renewable power generators are connected to the dc power grid directly, dc bus voltage is affected from them. Therefore, the improvement of the transient response against the variation of the dc bus voltage is required to control...
Motor current measurement techniques as well as predictive control algorithms for electric drives rely on an assumption of linear motor currents changes resulting from constant inverter output voltages. Recent research has reported that this assumption does not hold in motors with short electrical time constant, and in drives whose rotor position advances substantially during a control period. This...
Microinverters connect a single photovoltaic (PV) module to the grid, and therefore require a high voltage step-up conversion ratio. This is usually achieved in a two-stage approach with a step-up dc-dc converter followed by a step-down inverter. More recently single-stage step-up inverters have been proposed under the assumption that less stages improves efficiency. This paper compares these two...
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