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In this paper, the stability of solid state transformer (SST)-paralleled inverters system is investigated by using the unified impedance-based stability criterion (UIBSC). Theoretical analysis reveals that the output impedance characteristics of SST are frequency-dependent and multiple resonances can happen in the SST-paralleled inverters system. A lead-lag controller and a negative impedance feedback...
This work introduces a new method for connecting offshore wind turbine generators (WTGs) in series when interfaced to a medium voltage DC (MVDC) collection grid. Limiting the series stacking to pairs of WTGs and introducing a power sharing converter (PSC) stage between them allows series connected WTGs to operate at independent power levels in a voltage sourced collection grid. This allows for reduced...
In this paper, the methodology to analyze Non-Detection Zone (NDZ) of islanding detection algorithm for multiple Power Conditioning Systems (PCSs) connected to grid is proposed. The PCSs with renewable energy source or battery energy storage system are equipped with anti-islanding functionality and the method using frequency positive-feedback is one of the most popular methods to detect islanding...
In this paper analytical study have been undertaken to relate the operating frequency of the inverter in inductive power transfer system used to charge the electrical vehicle that is free to move. The distance varies the mutual inductance of the pickup coil and the resonance frequency of Inductive Power Transfer system. The study also shows the maximum power transfer is achieved by the appropriate...
Islanding is a condition in which the micro grid is disconnected from the main grid which consists of loads and distribution generation. Islanding is required whenever there is a fault and whenever the maintenance is required. Under normal condition or stable condition, the system works under constant current control mode. After islanding the system switched to voltage controlled mode. There are different...
This paper presents a novel prototype of a time-sharing frequency doubler principle-based current-fed zero current soft-switching (ZCS) high frequency resonant (HF-R) inverter for inductive power transfer (IPT) systems. The newly-proposed ZCS HF-R inverter is suitable for producing a higher frequency resonant current with switching power loss reduction by using a middle-class switching frequency insulated-gate-bipolar-power...
Grid-connected Voltage Source Inverter (VSI) with LCL filters, controlled by proportional-resonant compensator, is very popular in utility application for its better power quality feature, while it is prone to instability especially under weak grid condition. This paper deals with this issue utilizing the terminal impedances of the inverter and the grid. Firstly, the instability mechanism is revealed...
For grid-connected LCL-filtered inverters, recent applications often observe a weak grid at the point of common coupling (PCC) with non-negligible grid impedance. In this case, the previous control methods would perform poor or even cause the inverter protection. Especially when the feedforward of PCC voltage is designed to suppress grid current harmonics, phase and gain margins will be largely reduced...
Bidirectional and wireless power delivery to electric vehicles (EVs) or vehicle-to-grid (V2G) applications can be realized through bidirectional inductive power transfer (BD-IPT) technology but typically requires a three-stage power conversion process. This paper proposes a novel single-phase AC-AC BD-IPT system that requires only a two-stage power conversion process to facilitate wireless power transfer...
This paper investigates the performance of Slip mode frequency shift (SMS) islanding detection method (IDM) in the presence of different inverter interface control strategies (IICS). The Impact of the two constant-current and constant-power IICS when the inverters are equipped with SMS-IDM, are compared and analyzed from detecting islanding point of view. This study is based on time-domain simulations...
The concern for the supporting power converters is unavoidable in the development of inductive power charging system technology for electric vehicle application. In both the primary and secondary sides, power converters are needed to both generate and harvest the high frequency AC power which is transferred wirelessly in a resonant frequency. In his paper, we develop the power converters that are...
Energy crisis is becoming one of the major challenges in today's world due to increased energy demand and at the same time decreased energy resources. Energy from renewable sources can never be exhausted. They cause less emission and therefore stand out as a potentially viable source of clean and limitless energy. Residential Microgrid, which is a new concept, can operate as standalone or as a grid-connected...
Advanced lumped-element immittance inverters supporting dual-frequency operation and tunability of operational frequencies are the key enablers to design small-size tunable dual-bandpass filters. The paper presents a design concept of tunable dual-frequency immittance inverters based on the dual-composite right/left-handed transmission line (D-CRLH TL) unit cells with variable capacitors. Tunability...
In this work we present a complete end-to-end interface for a capacitive micromachined ultrasonic transducer (CMUT) intended for low-power gas sensing applications. A prototype chip was designed in a 0.18-μm BiCMOS process. Different blocks (a BJT-based Colpitts oscillator, an inverter-based oscillator, a sine-to-square wave converter, a digital frequency counter, and a parallel-to-serial converter)...
In this paper, a LLC resonant DC-DC converter with voltage multiplier (VM) rectifier is proposed. The proposed converter circuit consists of four main components, which are the full bridge inverter, a resonant tank (LLC), a high voltage transformer, and a high voltage VM circuit. The proposed circuit regulates the output voltages by narrowly varying the switching frequency. The LLC resonant circuit...
Recently Wireless Power Transfer (WPT) is widely studied in order to efficiently feed many different kinds of loads through a large air gap and loosely coupled transformer. The transformer presents large leakage inductances, resulting in poor voltage regulation against load variation. Moreover, the low magnetizing inductance, results in high magnetizing currents, reducing the overall efficiency. In...
This work presents the development and implementation of four control configurations for photovoltaic inverter. These configurations are: Proportional Integral plus Resonant controller, Proportional Integral plus Repetitive controller, Proportional Integral-Proportional plus Resonant Controller and Two Degrees of Freedom plus Repetitive control with the aim of reducing the Total Harmonic Distortion...
This paper presents a self-oscillating electronic driver for a 36 W LED string. The design consists of a simple control that reduces the component number and cost of the driver. Self-oscillating converters are popular in compact fluorescent lamps; therefore, it is proposed the use of this self-oscillating control technique for the LED lamp. The self-oscillating LED driver represents a very suitable...
The system resonance frequency of a grid connected inverter with LCL filter depends on the filter parameters and the time varying grid impedance. To obtain stability and to preserve good dynamic behavior of the system, grid impedance adaptation of the current controller is proposed. The design of the current controller is described and the adaptation strategy to prevent the excitation of the system...
In order to make a quantitative analysis of the power loss in wireless power transfer system, a comprehensive analysis of all the losses of a magnetic resonant wireless power transfer system is presented in this paper. The skin effect, proximity effect and high frequency radiation is also taken into account in coils whose internal AC resistance and high frequency radiation resistance are presented...
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