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.
Variable carrier single rate deadbeat control method for low carrier frequency was proposed. In the large capacity inverter system, the carrier frequency range is limited to relatively lower frequency range, the trade off between the control accuracy and the efficiency should be considered. Digital hysteresis control was applied to the inductor current, suitable carrier frequency was adopted in every...
In this paper, Lyapunov law based model predictive control scheme is proposed for the grid integration of 3L-neutral point clamped (NPC) inverter. Lyapunov law based cost function, which aims to select the optimal voltage vector using system discrete model equations just once in each control cycle is able to reduce the current tracking error. Thus, low THD symmetrical current is injected to the utility...
This paper proposes a power-circulating operation at light load operation for a parallelly-connected dual-active-bridge (DAB) converter in order to achieve zero voltage switching (ZVS) over entire load range and wide battery-voltage variation. At the light load, a power flow of each DAB converter is controlled in such a way that the transferred power of each DAB converter satisfies the condition for...
This article presents the efficiency analysis of a 5 MW wind turbine generating system in an all-DC wind park comprising of a permanent magnet assisted synchronous reluctance generator (PMaSynRG) system as well as an IGBT equipped forced-commutated inverter. In this article, the focus is on the NPC converter and DC-DC converter with an optimized high-frequency transformer. The total efficiency through...
Virtual synchronous generator (VSG) has been developed recent years as a promising grid-tied inverter control strategy because it can improve the penetration of the renewable energy. Due to introducing virtual inertia, the active power loop of VSG behaves as a typical second-order system, which may cause active power oscillation. It is a key issue that designing the parameters of active power control...
Compared with traditional plug-in charging method, wireless power transmission (WPT) is recognized as a more convenient and safer means for electric power transfer. To enhance efficiency of the whole system and reduce EMI, zero-voltage switching (ZVS) of primary inverter should be achieved, while maintaining constant current charging for battery. Consequently, the phase of primary resonant current...
In this paper, a sensorless active damping scheme of LCL-filter is proposed in grid-connected parallel inverters for battery energy storage systems. The proposed damping method is superior to the conventional notch filter and virtual damping methods with respect of robustness on the variation of resonance of the filter and unnecessary additional current sensors. The theoretical analysis of the proposed...
The inverter with critical loads should be able to provide critical loads with a stable and seamless voltage during control mode change as well as clearing time. The indirect current control has been proposed for providing stable voltage with critical load during clearing time and seamless control mode transfer of inverters. However, the islanding detection is difficult since with the indirect current...
Power factor displacement and voltage fluctuation might produce due to high reactive power consumption of loads or long distribution lines. These power quality problems need more consideration in islanded microgrids (MGs) due to operating in low voltage grid with the absence of main grid. In this line, a novel control strategy for static synchronous compensator (STATCOM) is proposed in this paper...
In-wheel motor is one of the expected electric vehicle technologies which has superiority in the vehicle control aspects. However, the integrated in-wheel motor in which the inverter is integrated with the motor makes thermal problems because of the reduction of cooling area. This paper analyses a cooling system of the inverter integrated in-wheel motor and considers the operating conditions of the...
In this paper, an 1.2 kW thermoelectric generation system (TEG) for industrial waste heat energy recovery is developed and implemented. To achieve better performance, a novel hybrid maximum power point tracking (MPPT) method is also proposed. Comparing with conventional perturb and observe (P&O) technique and variable-step P&O method, the presented MPPT method can improve the tracking speed...
The magnetic coupling of filter inductors is widely utilized in various power electronics application fields including dc-dc converters in EV charger system in order to enhance the filtering performance while maintaining the minimal filter size. The optimal distribution of self and mutual inductance of coupled inductor is regarded to be one of important design tasks with respect to the coupled inductor...
This paper proposes a gate drive circuit with multiplexed transmission systems based on frequency-division multiple access for by using surface acoustic wave (SAW) filters. The SAW filter are suitable for use in the gate drive circuit because of their capability to operate at high temperatures and galvanic isolation. The proposed gate drive circuit using SAW filters can reduce the number of signal...
This paper improves the permanent magnet (PM) machine position sensorless drive specifically for high speed operation. To obtain the rotor position, an approximation is typically assumed on the position estimator where the estimated position is almost equal to the actual position per sample instant. This small signal approximation might not be valid at high speed when the ratio of sampling frequency...
In this paper, a novel hybrid maximum power point tracking (MPPT) method under partially shaded conditions (PSC) is proposed. The duty cycle of the dc-dc converter is controlled from small to large with fixed intervals in order to scan the P-V characteristics curve under partially shaded conditions, and then find out the maximum power value, which is called duty sweep (DS) algorithm in this thesis...
This paper proposes a novel hybrid modulation technique for 3-phase dual-stage bidirectional inverter to achieve electrolytic capacitor-less design for the fuel cell vehicles (FCVs) propelling system. The 3-phase bidirectional inverter consists of front-end naturally clamped current-fed dual-active-bridge dc/dc converter and back-end voltage-fed six switches 3-phase inverter. The front-end converter...
The purpose of this paper is to present the wide feedback gain changeable control dc-dc converter to improve the transient response. In general, the control gain is set to a value as large as possible considering the stability of the system when a quick response is required. A quantization error has the resolution of the digital controller coarse in such a case. Also, the oscillation based on the...
This paper proposes a new high-efficiency PV converter for grid connection through a high-leg delta transformer. The converter is composed of a symmetrically-connected boost converter and three half-bridge inverters. One of the three half-bridge inverters is connected to the boost converter, and the others are directly connected to the PV terminals. As a result, this circuit configuration enables...
This study proposes an enhanced current control strategy to eliminate DC and harmonic current at the output current of three-phase grid-connected inverters caused by DC offset and scaling error in grid voltage measurement. The proposed current controller designed in the stationary (α-β) reference frame is developed with a proportional integral (PI) plus three resonant controllers where the resonant...
In this study, a microcontroller-based battery test system for power battery is realized. This system is composed of a microcontroller, a sampling circuit, a human interface and a resonant load. The proposed resonant load with wide-range slew-rate and continuous loading function is used to verify the feasibility of the battery test system and can recycle energy in test procedure. Furthermore, the...
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.