The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper introduces a PWM method for paralleled inverters which can achieve zero common-mode voltage. The paralleled inverters are connected through coupling inductors to the load. Based on the voltage vectors in each inverter, paralleled voltage vectors are proposed to combine the reference voltage. The action time can be distributed to each inverter and achieve zero common mode voltage for output...
In this paper, a hybrid control of IPT system is proposed in limited operating frequency range according to coupling coefficients. The coupling coefficient k and self-inductance of pad vary according to misalignment and vertical distance condition in inductive power transfer (IPT) system. Those variation cause change of output voltage and zero phase angle (ZPA) frequency. Proposed method enables the...
This paper presents the design and implementation of a tunable bandpass filter with constant absolute bandwidth. Two types of coupled microstrip lines in the anti-parallel and pro-parallel formats with varactor-loaded ⋋/2 resonators are investigated to demonstrate its advanced capacity in control of the bandwidth variation. In this design, two adjacent resonators are coupled with each other through...
The Static Synchronous Compensator (STATCOM) is one of the most widely used Flexible AC Transmission System (FACTS) device which is based on a voltage source converter with a dc link capacitor. This paper presents the mathematical modelling of STATCOM in dq domain, with the Q-Vdc controller to control the reactive power flow in the system and to maintain the dc voltage at a constant value. The control...
Wireless transfer of power is an ever growing field of technology which has a wide array of applications ranging from charging of electric vehicles (EVs) to small devices such as medical implants. This can be implemented through highly resonant near field coupling of electromagnetic resonators. This work primarily focuses on the development of a wireless power transformer for implanted medical devices...
The LC hybrid active power filter (LC-HAPF) is able to compensate reactive power and harmonics with operating voltage lower than the grid voltage. The quasi proportional-resonant (PR) controller could reduce the current tracking error by increasing the open loop gain at the selected frequency. Multiple PR controllers have been adopted for improving harmonic compensation in LCL filter coupled grid-connected...
A third-order Frequency Selective Surface based on inverter interlayers is presented. Second order FSS filter design method using coupling interlayer has been previously proposed [1]. Coupling interlayers are essentially spatial inverters that can be simply adjusted to control the transfer function of the filters. To demonstrate the design flexibility in realizing multi-pole FSS filter based on spatial...
In this paper, the speed control for two series-connected five-phase permanent magnet synchronous motors (PMSMs) is first proposed where both speeds of two five-phase PMSMs can be controlled independently without any position sensors. In first, the concept of the extended electromotive force (EEMF) developed for single motor is extended for two series-connected five-phase PMSMs. Some experimental...
Contactless Capacitive Power Transfer (CPT) is one of the emerging fields in the area of wireless power transfer. The system is fairly analogues to the inductive power transfer system. The CPT systems was primarily used for low power and small distance applications due to the development of unsafe voltages across the capacitive interface. However, the use of new compensation networks have enabled...
This work presents a new topology for the matchingnetworks of an underwater wireless power transfer system.A class-D driver is used in resonance at fundamental and third harmonic frequencies. The double resonance helps reducing the reverse voltage stress at the diode rectifier. We present the analytical derivation of the proposed network and demonstrate the design procedure with an example. We also...
In this paper the main features of a transformerless 10 kW three-phase inverter, compliant to IEC-61850 communication standard, will be presented. It will be used for a research project concerning the study of grid harmonics pollution produced by high penetration of DER (Distributed Energy Resources). It will allow testing different harmonics mitigation and power injection control strategies.
Nowadays most BPF's from MHz to tens-GHz are designed with the application of J/K-inverters. It is however desirable to find such way of filter realization which can be arbitrary modified through adding reactances among filter and termination as additional physical connection to obtain simplest possible recalculations of the networks. This paper presents analytical method of synthesis for BPF with...
This paper presents a design procedure for wireless power transfer (WPT) systems based on the class-E2 dc-dc converter, taking into account inductive coupling-coil optimizations. The WPT system model is formulated as an equivalent circuit model by expressing the inductive coupled part as a transformer with low-coupling coefficient and equivalent resistances of primary and secondary coils. By using...
Various Islanding Detection Methods (IDMs) for distributed generations are reviewed in this paper. Special consequence is put on some of the islanding detection systems based on “active methods” and “Passive Methods” for distributed generations based system. Islanding can be dangerous to utility workers, who may not realize that a circuit is still powered. Moreover, extended islanding can also prevent...
Conventional Pulse Width Modulated (PWM) inverters create common mode voltage with high frequency and dv/dt. Common-mode voltage causes motor shaft voltage, bearing current and electromagnetic interference (EMI) in the induction motor drive system. In this paper, a common-mode voltage eliminated 2-level space vector pulse width modulation scheme based on a cascaded 3-level inverter is presented. When...
Voltage-controlled inverters have been widely used in distributed generation due to their flexibility and smooth transition between grid-connected and islanded modes. However, in the grid-tied mode, the inherent coupling between active and reactive power will challenge the independent control of active power and reactive power, and therefore deteriorate system performance. To deal with this issue,...
Concentric coils are used in domestic induction heating system to improve the range of cookware sizes suitable to be heated up because the coils are switched on or switched off depending on the degree of their covering by the pot. The power is supplied by power converters, typically single-switch or half-bridge inverters, feeding the coils with a medium frequency current. However, the switching frequencies...
Grid-connected inverters (GCIs) are power electronics interfaces to connect distributed energy resources into the grid. In order to improve the performance of distributed energy resources as well as maintain the high power quality of the grid, it is important to understand the characteristic of GCIs with appropriate controllers depending on its applications. This paper presents a study on the effect...
Deadbeat-direct torque and flux control (DB-DTFC) has been emerged as a high performance digital control law for induction machines and permanent magnet machines. Its key attributes are excellent dynamic performance, the use of only one single control law over a wide torque/speed range and direct applicability to overmodulation strategies. This paper extends prior research by presenting the implementation...
This paper presents a mathematical modeling of three-phase grid-connected inverter system including output LCL filter and closed loop control using complex vector notation. The control scheme used is synchronous frame PI control on complex space vector of grid current in synchronous dq reference frame. Effect of controller's tuning parameters is investigated using complex vector root locus and complex...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.