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.
For the LCL-filtered grid-connected inverter, it has been reported that the digital time delays will narrow the stable region of current control loop when the inverter-side current is used for implementing the feedback control. A sufficient stable condition is that the filter resonance frequency should be designed under one-sixth of sampling frequency. However, the low resonance frequency leads to...
In this paper, a system based on concepts of MultiAgent Cooperative Systems is designed. It allows synchronizing inverters from two consensus Algorithms. This approach is made to designing smart devices (Smart inverters) through communicating the state among all the inverters by the Multi-Agent network in order to maintain stable frequency, phase, and voltage. The inverter is controlled by a deadbeat...
Based on the demands of TEA CO2 laser, high power, high-precision and high repetitive rate charging technologies of capacitor charging power supply was discussed in the paper. Capacitor charging power supply adopted series resonant circuit has constant current and "fixed voltage steps" charging characteristics which were analyzed in the paper in theory. Because of the constant current charging...
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...
This paper proposes a power control of LLC resonant inverter for an induction furnace using asymmetrical duty cycle control (ADC) with phase limit to guarantee zero voltage switching (ZVS) operation and protect switching devices from spike current during the operation. The output power can be simply controlled through duty cycle of gate signals of a full-bridge inverter. With the phase limit control,...
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...
The photovoltaic (PV) grid-connected power generation has become an important direction of energy development. A grid-connected inverter is the key equipment in the PV grid-connected system. The efficiency and performance of the PV grid-connected inverter mainly depend on its topology and control technology. The PI controller has good dynamic and steady-state performance, which is widely used in the...
Connection of distributed generations to the power grid is regulated by international standards. Proportional Resonant-type (PR) compensators are widely used for controlling single-phase grid-connected inverters. Those controllers are normally designed based on frequency response approach and system requirements such as phase margin (PM) and speed of transient response. This paper concerns the design...
The main goal of this paper is to underline the limitations of LCL interface filter used in three-phase shunt active power filter for active traction substations. Starting from the two main functions that should be fulfilled by the interface filter, i.e. let them unchanged the current harmonics that must be compensated and stop harmonics due to inverter switching, it is shown that they can not be...
Processes in the power scheme double-bridge series resonant converter are considered. The equivalent circuit of the converter based on the imposition of linear active resonant contours with sources of rectangular form voltage is applied to the analysis of processes. The expressions for the discrete the control-to-output-envelope transfer functions of the active resonant contour and of the resonant...
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...
Because of the increasing use of renewable energy technology, distributed power sources and greatly varying loads can be critical factors in power system destabilization. This problem has hampered the adoption of renewable energy; thus, researchers have studied various control method types that enable an inverter to be operated as a synchronous generator (SG). Some of these methods, referred to as...
In this paper the theory and simulation results of the series resonant inverter / converter are presented. In this work the authors carried out a detailed comparative analysis of results obtained using the method of AC analysis in the steady state for the first harmonic with the results of computer simulation. The AC analysis under certain conditions can lead to errors disqualifying this method. In...
This paper presents a comparison of two control strategies between the fixed-frequency method and the variable-frequency method for output power control of a full-bridge resonant inverter in domestic induction cooking to address an issue of the distorted load current due to low-quality-factor load. The control strategies are based on the asymmetrical control using positive half-cycle control while...
This paper presents an ozone-generation system with modular expansion and two-terminal driving mechanism to improve the ozone-generating performance. This study is concerned because the high AC voltage is often utilized to excite the ozone ceramic chip and a high withstand voltage are required for components, possibly causing a larger complexity of circuit design. This paper, therefore, suggests a...
The acceleration sensitivity and its related problem of force-frequency in quartz resonators were studied. We studied the effects of initial nonlinear strains versus the effects of nonlinear elastic constants on the force-frequency problem of quartz resonators subjected to bending forces. We found that for quartz thickness shear resonators subjected to bending, the force frequency effect could be...
This paper presents the original synthesis method for band-pass filters, that allowable are arbitral transmission zeros occurring at each side on the pass-band. This method employs const J-inverters and polynomial effective-linearization of band-stop reactances. Proposed synthesis is of course an analytically simply solvable. Attained frequency responses of designed filters give expected sufficient...
Harmonic Quasi Resonant (HQR) control is widely adopted to suppress the harmonic currents for LCL-filtered inverters in stiff grid. However, inverters with HQR control may observe instability when the point of the common coupling (PCC) behaves uncertain impedance or the HQR control frequency is out of the bandwidth of the system control loop. Besides, it could not effectively eliminate the harmonics...
The distributed inverters are generally integrated into power grid without switching sequence coordinated control capability since they are equipped with their own micro controllers to command the output quantities. The switching ripples of all distributed inverters will then be randomly accumulated at the point of common coupling. The recently proposed global synchronous pulsewidth modulation (GSPWM)...
Open-end winding topology with a common DC source has path for zero-sequence current. Zero-sequence current needs to be suppressed because it does not contribute to the drive torque but has harmful effects such as loss and torque ripple. Both inverter and motor have sources of the zero-sequence component. The zero-sequence source on the inverter side is the voltage error due to dead time in switching...
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.