Hybrid filter operation during nonlinear load current pulsations

1997 ◽  
Vol 16 (1) ◽  
pp. 38-48 ◽  
Author(s):  
Leszek Fracckowiak ◽  
Ryszard Strzelecki
Keyword(s):  
Hybrid Filter ◽  
Nonlinear Load ◽  
Load Current ◽  
Filter Operation

Power Quality Improvement by Solar Photo-voltaic / Wind Energy Integrated System Using Unified Power Quality Conditioner

2017 ◽  
Vol 8 (3) ◽  
pp. 1416 ◽  
Author(s):  
Sarita Samal ◽  
Prakash Kumar Hota
Keyword(s):  
Wind Energy ◽  
Power Quality ◽  
Reactive Power ◽  
Integrated System ◽  
Quality Analysis ◽  
Nonlinear Load ◽  
Load Current ◽  
Voltage Unbalance ◽  
Photo Voltaic ◽  
Sudden Decrease

The  real problems in diminution of power quality occurs due to the rapid growth of nonlinear load are leads to sudden decrease of source voltage for a few seconds  i.e sag, swell, harmonics in source and load current, voltage unbalance etc. All these   problems can be compensated by using Unified Power Quality Controller (UPQC) and the operation of UPQC depends upon the available voltage across capacitor present in dc link. If the capacitor voltage is maintained constant then it gives satisfactory performance. The proposed research is basically on designing of Photo Voltaic (PV) /Wind energy fed to the dc link capacitor of UPQC so as to maintain proper voltage across it and operate the UPQC for power quality analysis. The said model is simulated in Matlab and results are verified by using FFT analysis.The proposed PV/ Wind energy-UPQC is design in Matlab simulation for reduction of voltage sag, swell, interruption of voltage, harmonics in load current and compensation of active and reactive power.

scholarly journals Harmonic Suppression of Shunt Hybrid Filter Using LQR-PSO based

2017 ◽  
Vol 7 (2) ◽  
pp. 869
Author(s):  
Nor Shahida Hasan ◽  
Norzanah Rosmin ◽  
Saifulnizam Abd Khalid ◽  
Dygku. Asmanissa Awg. Osman ◽  
Baharuddin Ishak ◽  
...  
Keyword(s):  
Linear Quadratic Regulator ◽  
Pso Algorithm ◽  
Harmonic Suppression ◽  
Linear Quadratic ◽  
Hybrid Filter ◽  
Nonlinear Load ◽  
Hybrid Active Power Filter ◽  
Lqr Controller ◽  
Trial And Error Method ◽  
Error Method

In linear quadratic regulator (LQR), two different weighting matrices play an important role in presenting the performance of this controller. Instead of using classic common approach, which is trial and error method, this study proposes a particle swarm optimization (PSO) algorithm to track the best solution of the weighting matrices. The proposed algorithm is tested on shunt hybrid active power filter (APF) to mitigate the harmonic contents in voltage and current signals in a nonlinear load system. The modeling work of this proposed system is simulated using MATLAB/Simulink software. From the simulation, the obtained results proved that using PSO in tuning the LQR controller produce smoother nonlinear voltage and current signals. In fact, the amount of current to be injected into network can be reduced up to 95%. Besides, less time is consumed during searching the optimum weighting matrices using the proposed approach.

scholarly journals Distribution Static Compensator Using an Adaptive Observer Based Control Algorithm With Salp Swarm Optimization Algorithm

2021 ◽  
Vol 6 (1) ◽  
pp. 52-62
Author(s):  
Jayadeep Srikakolapu ◽  
Keyword(s):  
Optimization Algorithm ◽  
Reactive Power ◽  
Phase Distribution ◽  
Harmonic Distortion ◽  
Pi Controller ◽  
Adaptive Observer ◽  
Nonlinear Load ◽  
Swarm Optimization ◽  
Load Current ◽  
Static Compensator

In this work, an adaptive observer supported fundamental extractor is developed to estimate the fundamental components of the load current for a three phase distribution static compensator (DSTATCOM) under nonlinear load. Main variations in the proposed work are the fundamental drawing out from the distorted load current and estimation of PI controller gains. With this observer, salp swarm optimization algorithm (SSOA) is used for estimation of DC PI controller and AC PI controller gains. The estimated gains are used for DC bus voltage and AC terminal voltage error minimization respectively. This optimization algorithm commendably progresses the initial random solutions and converge to optimum. Pareto optimal solutions are approximated in SSOA with prodigious convergence and coverage. The SSOA can search unknown spaces and can deal with real world problems for solutions. The suggested control scheme with the optimized gain values has controlled the power quality issues like improving the total harmonic distortion (THD) of grid current and decreasing burden of reactive power on the grid caused due to a nonlinear load. The laboratory performance of the considered system with adaptive observer using d-SPACE-1104 has been provided for implementation work.

scholarly journals Nonlinear load influence on single-phase fault current in shipboard electric networks

2021 ◽  
pp. 59-64
Author(s):  
И.Е. Кажекин ◽  
С.П. Финько ◽  
М.С. Харитонов
Keyword(s):  
Single Phase ◽  
Fault Current ◽  
Electric Networks ◽  
Steady State Mode ◽  
Nonlinear Load ◽  
Load Current ◽  
Higher Harmonics ◽  
Ground Fault ◽  
Electrical Installation

Описаны результаты исследований влияния показателей качества электроэнергии на токи однофазных замыканий в судовых электроустановках. Выявлены основные элементы бортовых электроустановок, влияющие на качество электроэнергии. Проанализировано формирование высших гармоник в токе однофазного замыкания. На физической модели электроустановки проведены исследования влияния нелинейной нагрузки на ток однофазного замыкания. Результаты экспериментов подтвердили установленные закономерности. Выявлено, что в установившемся режиме ток однофазного замыкания определяется не только величиной фазной емкости и напряжением сети, но и несинусоидальностью тока нагрузки. Экспериментально показано, что высшие гармоники, присутствующие в токе нагрузки, усиливаются в токе однофазного замыкания. При этом увеличение их амплитуд пропорционально номеру гармоники и ее амплитуде в токе нагрузки. Экспериментально установлено, что формирование высших гармоник в токе однофазного замыкания в результате эмиссии нелинейной нагрузкой приводит к увеличению его действующего значения. The paper represents the research results of the power quality indicators influence on the currents of single-phase ground faults in ship electrical installations. The main elements of on-board electrical installations that affect the quality of electricity are identified. The process of higher harmonics formation in the single-phase ground fault current is analyzed. Studies of the nonlinear load influence on the single-phase fault current are carried out on the physical model of the electrical installation. The experimental results confirmed the established patterns. For the steady-state mode it was discovered that the single-phase ground fault current is determined not only by the phase capacitance value and the mains voltage, but also by the non-sinusoidality of the load current. It has been shown experimentally that the higher harmonics of the load current are amplified in the single-phase ground fault current. In this case, the increase at their amplitudes is proportional to the harmonic number and its amplitude in the load current. It has been experimentally established that the formation of higher harmonics at a single-phase ground fault current as a result of emission by a nonlinear load leads to an increase in its effective value.

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