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A control scheme of the voltage ripple suppression for the permanent magnet exciter generator is proposed in this paper. The output voltage of the permanent magnet excitation generator is affected by the field current, load current and the engine speed. The engine speed can be controlled by the engine governor. However, the actual frequency changes at starting and sudden load variation. As a result,...
The hybrid AC/DC microgrid structure is considered to be the future trend of power systems, due to the vital necessity of connecting more renewable energy sources and storage elements to supply modern AC and DC loads. This paper proposes a power sharing and control strategy for hybrid AC/DC microgrids using the droop control technique. A new structure of the hybrid microgrid is suggested by connecting...
The proposed circuit aims to harvest energy from freight railcars, in which a three-phase electromagnetic generator (EMG) is used to harvest kinetic energy. The key idea of the proposed circuit is to extract maximum power from the EMG through impedance matching until the charge level of the battery reaches 90%. Once, the battery reaches the charge level, it switches the operation mode and regulates...
Wind power has an important place in renewable energy systems. Therefore, it is vital to make use of wind power systems by obtaining maximum efficiency. The energy produced by the wind power systems shows variance depending on the speed and direction of wind and in some cases the wind power may not be at the expected level for the on grid micro inverter. This study aims to increase energy sustainability...
A sliding-mode model reference adaptive (MRA) observer-based model predictive current control (MPCC) strategy is developed for permanent magnet synchronous motor (PMSM) drive systems with DC-link voltage sensorless. Generally a DC-link voltage sensor is indispensable for PMSM drive fed by voltage source inverter (VSI) to implement MPCC. In response to DC-link voltage sensor fault, by combination of...
This paper discuss about the investigation of 150kV capacitor voltage transformer (CVT) breakdown which is occurred simultaneously after capacitor bank disconnecting process. Analysis is performed referring to the last routine maintenance and digital fault recorder (DFR) data. Based on the analysis of both data and transient simulation analysis from the model created to represent the condition during...
This paper presents a multifunctional interface circuit for the battery-ultracapacitor hybrid energy storage system (HESS). Both the voltage equalization of the battery banks and energy exchanging between two kinds of energy source will be realized, by using the appropriate control strategy. Thus the reliable work and the health of the battery bank can be maintained, and the ultracapacitor (UC) can...
A hybrid railway power conditioner (HRPC) is developed based on chopper cell modular multilevel converter (MMC) with four legs. The HRPC is able to compensate unbalance currents and reactive power. Its operational voltage at one phase is much lower than the voltage of the railway supply system. This phase of the MMC is connected to the 27.5kV bus without coupling transformer by using a MMC. The application...
We are considering the problem of controlling a single-phase Multicellular inverter with LC output filter. The control objectives are: (i) generating a sinusoidal voltage with amplitude and industrial frequency fixed by the reference signal, (ii) ensuring a good convergence of the voltages across the flying capacitors. The controller is designed using the backstepping approach in its adaptive versions...
This paper experimentally analyses and highlights the origin of spurious noise of differential millimeter-wave rectifier. The measurement results reveal that the RF signal leakage into the rectifier's dc output node due to lower isolation at millimeter-wave frequencies, and the transistors' flicker noise, as well as the shot noise are the main noise source in the rectified voltage. Furthermore, layout...
A control strategy for TSVG is proposed in this paper, which is a kind of hybrid static var generator (SVG), based on Active disturbance rejection controller (ADRC) theory. TSVG is a parallel topology between thyristor switch filter (TSF) and SVG, and integrates the good features of reactive power compensation and harmonic suppression together. In order to improve the performance of SVG, a controller...
In electric vehicle charging equipment, energy metering is a basic function, and the real-time monitoring for the safety of the charging process is essential. Electric vehicle AC charging pile is a convenient and efficient electric vehicle charging equipment, but the internal module of traditional AC charging pile scatters seriously. The volume of the AC charging pile is so large that is not conducive...
This paper based on the commutation mechanism of series capacitor commutated converter (CCC), the CCC is applied to UHVDC transmission system, and the mathematical model of reactive power demand of CCC inverter is established. According to the actual parameters of Jiuquan-Hunan ±800 kV UHVDC transmission project, the simulation model of CCC- UHVDC system is built by PSCAD/EMTDC simulation software...
A reasonable and stable droop based hierarchical coordinated control with primary, secondary, and tertiary control steps is proposed for the operation of a grid-connected mode. Interlinking converter and the grid forming sources are coordinated. The droop based hierarchical control scheme handles active power imbalance in microgrids reasonably while performing exact power sharing. In addition, the...
A cost effective circuit to charge and discharge secondary batteries by an arbitrary current waveform is developed for investigating deterioration characteristics of the batteries. A charging management integrated circuit (IC) is employed for controlling both charging and discharging because there are few ICs to control the discharging of the batteries. The circuit configuration with the common ICs...
This letter presents a voltage-controlled capacitor that varies from 20% to 100% of the rated capacitance (1 μF) with a control voltage from half of the voltage rating to 0 V. Capacitance, self-resonant frequency, and equivalent series resistance were measured with respect to the control voltage. An equivalent circuit and a nonlinear model derived from relationship between permittivity and electric...
In a Smart Grid environment measurements from remote sensors are telemetered to control centers and serve as input to many energy management applications. This, on one hand, has increased efficiency and reliability but at the same time has left the system exposed to cyber threats. This paper reviews the possibilities of such attacks and the impacts these might have on different power system operations...
This paper presents a DSP- and DC-DC converter- based photovoltaic (PV) emulator which can simulate the output characteristic of a real PV module. The control mechanism is a combination of the current mode controller with a modified look up table of PV module characteristic which generates the reference current based on the measurement of converter output voltage and current. A prototype of the PV...
Virtual oscillator control (VOC) and droop control are distinct methods to ensure synchronization and power sharing of parallel inverters in islanded systems. VOC is a control strategy where the dynamics of a nonlinear oscillator are used to derive control states to modulate the switch terminals of an inverter. Since VOC is a time-domain controller that reacts to instantaneous measurements with no...
Aggregation of behind-the-meter distributed energy resources holds promise to provide valuable services to the grid, enabling greater penetration of intermittent renewable energy sources. We propose the Smart Dim Fuse system as an approach to utilize loads for aggregation services. The Smart Dim Fuse, installed on individual circuits at the breaker panel, enables load power control without service...
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