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In this paper a new electric power structure for solar powered unmanned aircraft system is proposed. The presented topology is a prospective improvement to both Solong and Zyphyr models. The proposed UAS model utilized Zyphry UAS by using ac bus-line instead of dc bus-line to supply the propellers. The system involves PV array, lithium sulfur based energy management system, dc bus-line, inverter,...
This paper presents enhanced firefly Algorithm (EFA) for improving the control strategy of UPQC with the aid of wind energy conversion system (WECS). The proposed system is connected with the grid/load and their dynamic behavior is determined. The primary objective of the proposed technique is to mitigate the power quality (PQ) issues present in the system. In the proposed method, the performance...
H-bridge cascaded inverter can be used for harmonic compensation in medium and high voltage systems. As the equivalent switching frequency is high, L-type filter is commonly used for H-bridge cascaded inverter. Meanwhile, considering device safety and filtering effect, inductance value of L filter is large. When the command current contains harmonics, especially high harmonics, large connecting inductance...
Since the capacitor equivalent series resistance (ESR) above 1kHz almost stays constant, dc-link current root-mean-square (RMS) closed form equation is an easy way to evaluate the capacitor losses from the switching harmonic currents (SHCs). But when the ac current contains multiple low order harmonics (LOHs), their impacts on the dc-link has not been systematically studied. In this paper, a straightforward...
The control of the grid side current in an LCL filter based grid connected converter is generally complex and involve multi loop structure. This paper presents a method to control the grid current indirectly by controlling the converter side current with compensation of the filter capacitor current. The proposed control algorithm uses only one current sensor to measure the converter side current....
A method for generating reactive power in photovoltaic (PV) inverters is presented. This method is based on the extraction of active and reactive components present in the output current of a PV-Inverter using a scheme consisted of low pass filter. The extraction results, together with the unity sinusoidal signal obtained from the phase lockup loop is used to generate a reference for current controller...
Nowadays capacity of the photovoltaic systems in the grid is remarkable and provides a major part of energy in the grid. Therefore, an abruption of these systems from the grid can create a damage to the grid. Unlike in the past that PV systems disconnected from the grid when a voltage drop occurred, nowadays these systems should have Low Voltage Ride-Through (LVRT) capability. The PV system should...
This paper presents five-level series active power filter based on modified instantaneous reactive power theory control strategies. The standard configuration uses voltage source inverter with hysteresis controller, this configuration presents several drawbacks such us uneven switching frequency. Multilevel inverters are currently being investigated and used in various industrial applications. Five-level...
Recently, many high-efficiency buck-boost typed inverters for the photovoltaic (PV) grid-connection applications have been proposed. However, the PV grid-connection inverters are in idle state at nighttime or low insolation. Based on green energy demand, the presented work proposes a high-efficiency bidirectional buck-cascaded buck-boost (BuCBB) inverter. It is developed via the connection of a bidirectional...
The active power filter (APF) has already established itself as a prominent means of addressing harmonic pollution and other power quality issues. Current control of an APF is a key in achieving a good compensation performance. Generally, PI control is used owing to its simplicity and ease of implementation. However, using a proportional resonant (PR) controller can give an added advantage in tracking...
The power decoupling strategies of single-phase Z-source/quasi-Z-source inverter (ZSI/qZSI) to handle the inherent double-line-frequency (2ω) power are overviewed. They are categorized as passive and active power decoupling methods. The former suppresses the 2ω ripple by the impedance network, modified modulation methods, or closed-loop damping control. The latter diverts the 2ω ripple to the compensation...
This paper is focused on the presentation of a active filtering and regeneration system (SISFREG) developed for converting the DC traction substations in active substations. SISFREG will be connected between the catenary-line and the primary of the traction transformer, via a dedicated transformer. The main component of SISFREG is a shunt active power filter based on voltage source inverter structure,...
The work presents concept of 1-phase shunt Active Power Filter (APF) based on the modified sigma-delta modulator (SDM) in the control section. The modification depends on including in SDM the dynamic hysteresis comparator. Thank to this feature the resolution of SDM output bit stream is, theoretically, unlimited. As a result it is possible to more precise mapping of an APF input (power grid) current...
The aim of this paper is the design and implementation of the control algorithm of a PWM boost rectifier capable to handle bidirectional energy flow. For this goal, the boost rectifier control loops must be tuned for the proper operation of absorbing active power from the power grid and transfer it to the dc load at constant output voltage, and also to give the rectifier the ability to generate back...
In this paper, a new structure and the coordinated control method of a delta connected static var compensator (SVC) based hybrid active power filter (SVC-HAPF) for reactive current, harmonic current and unbalanced current compensation are proposed. The proposed delta-connected SVC-HAPF has the desirable characteristics of wide compensation range with low voltage/current rating requirement in the active...
In this work, three-phase single stage grid-connected photovoltaic system using current control inverter is simulated using Matlab/Simulink. To deal with varying irradiance conditions, the incremental conductance MPPT has been used, however in order to improve the power quality a three-level (NPC) inverter based SVM control together with LCL filter has been used. The main result of the project is...
In this paper some measures are taken to effectively weaken the harmonics in the inverter output voltage of low temperature waste heat power generation system with Organic Rankine Cycle (ORC), and to improve the dynamic performance of the system. Firstly, this paper detailed analyzed the harmonic characteristics of bipolar sinusoidal pulse width modulation (SPWM) method. Then the two order low-pass...
Input-series-output-series (ISOS) inverter system is very suitable for high input voltage and high output voltage power conversion applications. If the inverter system topology is applied to the grid-connected application, a large-capacity inverter system can be built with multiple small-capacity standardized inverter modules, which will improve system reliability and simplify system design. For the...
The implementation of 15 kV Silicon Carbide (SiC) MOSFETs in a three-phase, three-level active power filter of 100 kVA for a 10 kVAC grid and their challenges is shown. Due to the high switching frequency of 16 kHz, respectively 32 kHz ripple frequency, it will perfectly suited for active filtering of harmonics in the medium voltage grid.
Photovoltaic (PV) systems have been the focus of many scientific researches recently. The interest in grid-tied PV transformer-less inverters has increased rapidly, because of their higher efficiency and lower cost compared to traditional line transformer inverters. In this paper, a new modified transformer-less topology derived from H5 inverter is proposed. The proposed topology is equipped with...
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