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The increase in non-linear loads in the electrical network deteriorates the voltage waveform quality. One of the most used methods to correct the quality lack is to use shunt, series or mixed topologies of active power filters. Mixed filters can compensate loads that generate voltage harmonics and current harmonics, but the economic investment is high. Commercial shunt filters are more widespread...
A phenomenon that occurs when using the DQ Transformation to obtain the compensation references in active filter applications is presented in this paper, in which new harmonics that had not existed originally in the system, are injected to it. Although these new injected harmonics have very low magnitude, they do exist and correct processing must be assured in order not to increase their magnitudes...
This paper presents a control scheme for Static Compensators applied in distribution systems (DSTATCOM), that are used for regulation of voltage magnitude at point of common coupling (PCC) and it also has the function of eliminating harmonics of voltage through PCC-voltage-detection method. Voltage-magnitude regulation is accomplished through quadrature-current injection at PCC and harmonic mitigation...
In this paper a novel hybrid harmonic compensation approach for non-linear loads is developed and analysed. This technique provides compensation for current harmonics coming from a nonlinear load and reactive power regulation even during grid's voltage disturbances. The method could be implemented on any Series Active Filter. Meanwhile the Transformerless configuration (TSeAF) is selected in this...
In this paper a new single-phase five-level buck-boost active rectifier is introduced called capacitor tied switches (CTS). The proposed rectifier has two independent DC outputs that can be connected to two different loads. Different switching states and the average mode of the proposed topology are analyzed to design the associated controller aims at regulating the two output DC voltages, generating...
A new three-phase three level inverter topology is proposed in this work. The presented structure is characterized by the use of a Bidirectional Neutral Point Clamped (BNPC) in order to compensate harmonics and to eliminate the reactive power and load varying under sever source voltages conditions. The control technique is based on Lyapunov candidate. An energy-based Lyapunov control strategy is developed...
Tidal current conversion systems are moving towards commercialisation. Tidal energy developers are looking to optimise their systems by testing all the available options and taking advantage of the experience from the wind energy industry. The key focus of this paper is to compare an induction generator with a permanent magnet synchronous generator in a tidal current conversion system with onshore...
The output voltage references in grid connected Voltage Source Converters must be limited according to the available dc voltage to avoid over-modulation and windup of the current controllers. This may be especially critical for Active Power Filters (APFs), since uncontrolled over-modulation can cause unintended harmonics in the output voltage and interfere with the harmonic compensation. This paper...
A fault-tolerant tandem converter, based on a current-source converter and cascaded multilevel voltage-source active filter, is proposed as the grid interface for a 10MW superconducting direct-drive wind turbine generator. The converter reduces the possibility of a short-circuit fault, an issue with the extremely low generator reactance, while having a significantly lower DC capacitance requirement...
This paper presents the proposal of a three-phase current-source shunt active power filter (CS-SAPF) with photovoltaic grid interface. The proposed system combines the compensation of reactive power and harmonics with the injection of energy from a solar photovoltaic array into the electrical power grid. The proposed equipment presents the advantage of giving good use to the current-source inverter,...
The paper presents a comprehensive approach to the compensation of the grid current distortion for shunt active power filter systems. Four different sources of current distortion are addressed: imperfect grid synchronization caused by the distortion in the grid voltages, time delays in the estimation of compensating currents and grid voltages, fluctuations of the dc bus voltage, and the distortion...
This paper proposes a reduced voltage transformer based hybrid active power filter topology. It is a combination of two inverters with a split dc link voltage. The dc link voltage of the HFI is reduced by the transformer's turn ratio. Both the inverters are connected in shunt with the non linear load. The LFI provides a limited reactive power handling capability due to the high impedance in the shunt...
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