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This paper deals with attractive voltage-source single-ended sub-resonant HF inverter as a simple wireless power transfer (WPT) based on unidirectional IPT in addition to Dual Active HF inverter and HF rectifier as transmitter and receiver of WPT is developed for bidirectional EV2H smart energy management architecture. Firstly, the voltage source single-ended sub-resonant HF inverter using a single...
This paper proposes a power electronic transformer based on a capacitive coupler. The coupler consists of four plates which are parallel-placed very closely. And there is a dielectric layer between each two plates to increase the capacitance value. The two plates on the same side are placed close to each other to maintain a large capacitance. The system topology is symmetrical to achieve bi-directional...
Power electronic converters may interact with the grid, thereby influencing dynamic behavior and resonances. Impedance and passivity based stability criteria are two useful methods that allow for studying the grid-converter system as a feedback system, whose behavior is determined by the ratio of grid and converter impedances. In this paper, the ac-side admittance of the modular multilevel converter...
This paper proposes a new virtual space vector modulation (VSVM) scheme that can eliminate the common-mode voltage (CMV) for three-level neutral-point clamped (NPC) inverters with balanced neutral-point voltage. The proposed VSVM scheme is based on the virtual space vector concept, which constructs the virtual vectors from the original medium vectors to achieve zero CMV. Moreover, the neutral-point...
This paper presents a grid-connected bi-directional modular multilevel converter (MMC) with division-summation (D-Σ) digital control to achieve power injection and rectification functions. The D-Σ digital control is adopted to track current reference, regulate dc-bus voltage and cell voltage, and balance the upper and lower dc-bus voltages. It can accommodate wide filter inductance variation and take...
Static Synchronous Compensators (STATCOMs) have been applied for offshore wind power plants to satisfy the grid codes under both normal operation and grid fault conditions. This paper investigates the performances of two types of Modular Multilevel Cascade Converters (MMCC) for STATCOM applications, with the special focus on asymmetrical Low-Voltage-Ride-Through (LVRT) operation under grid faults...
This paper proposes a simple circuit configuration and a control strategy of Solid-State Transformer (SST). In the proposed circuit, it is possible to reduce the volume of heat sinks and passive components by using low voltage switching device with low loss characteristic and high frequency operation. Moreover, the circuit employed with the proposed control strategy operates stably even when the ripple...
Power sharing performance is a critical issue of hybrid energy storage system (HESS) in autonomous DC microgrid (MG). In this paper, a novel integral droop (ID) is proposed to mimic dynamic characteristics of the capacitor by using energy storages (ESs) with quick response. The main advantage of the proposed controller is that dynamic power sharing among ESs is automatically realized in the decentralized...
In this paper, an enhanced control strategy of the smooth transition between the grid-tied and stand-alone operation modes of the distributed generation (DG) inverter is proposed. In the grid-connected mode, the DG inverter controls active and reactive powers flowing into the grid by regulating grid currents using typical proportional integral plus resonant (PI+R) controllers, while direct voltage...
A novel high step-up DC-DC converter with ZVS turn-on switches and ZCS turn-off diodes based on several existed techniques such as coupled-inductor, active clamping, stacked capacitor and interleaved technique is designed and implemented in this paper. The main objective of proposed circuit is soft-switching operation. The leakage inductance of coupled inductors resonates with two secondary-side capacitors...
In this work, load current in a multi-unit microgrid is decomposed into components. These components reflect the nature of total connected load at the point of common coupling (PCC) with the utility grid. Each unit (composed of distributed energy resources (DER), interfacing converter, and filtering elements), contributes to the total current fed by the microgrid. The current supplied by a unit is...
Due to rapid deployments of power electronics in renewable energy sources and new loads, high levels of harmonics causes problems in current distribution systems. This paper presents an advanced harmonic extraction technique for detecting and extracting selected harmonics in a medium-voltage high-power system. A time-transformation technique is developed which can accurately extract the desired harmonics...
This paper proposes an implementation of an on-line maximum efficiency control for matrix-converter based IPMSM drive systems. A simplified efficiency model of the drive system is established first; as a result, the detailed model of the inverter loss and motor loss is not required. Next, by on-line searching the maximum efficiency operating point, the efficiency of the whole drive system can be significantly...
In this paper, the use of an adaptive control method for an induction motor is described. Using the conventional adaptive control method, it is possible to stably estimate the inverse time constants (both primary and secondary) during the powering mode. However, it becomes unstable during the regenerating mode. To solve this problem, there is a method that changes the adaptive control gain in the...
The harmonic performance of the slim dc-link adjustable speed drives has shown good performance in some studies but poor in some others. The contradiction indicates that a feasible theoretical analysis is still lacking to characterize the harmonic distortion for the slim dc-link drive. Considering the shortcomings of the present harmonic analysis methods, such as the time-domain simulation, or the...
High inertial loads are abundant in the industry and most of them are direct on line starter type induction machines with double cage rotors. Due to their higher starting time higher power dissipation in the rotor makes the rotor wear out and eventually gets destroyed. A new starting method proposed herein makes the motor start quickly and smoothly by using an inverter. After reaching it's steady...
This paper proposed new position control method with acceleration feedforward compensation under the limited control bandwidth in the position control system of the EGR valve. This method estimates the acceleration reference through analysis of the relation between position controller output and speed reference without pattern and differential. The proportional gain of the position controller and...
Due to their better figure of merits, gallium nitride field effect transistors (GaN FETs), when employed as the switching devices in power electronics applications, have better performance than conventional silicon metal-oxide-semiconductor field effect transistors (Si MOSFETs). One of the superiorities of GaN FETs is their ability to switch very fast, which results in low switching losses. However,...
Recently, a novel hybrid multilevel inverter topology, the EDA5, was presented. The novel inverter topology comprises of two floating capacitors and 16 active switches to achieve five-level output voltage waveform and achieves higher efficiency at low-modulation index compared to a five-level Active Neural Point Clamped (5L-ANPC) converter. In this work, a full SiC MOSFET version of the inverter is...
Recently, the use of induction-heating systems has increased, and wireless power transmission systems for electrical vehicles have also been launched. These applications are designed to operate under 100 kHz and close to electrical equipment or the human body. Therefore, it is important to discuss the effects of alternating magnetic fields and evaluate the electromagnetic interference to other equipment...
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