SHAF for mitigation of current harmonics with p-q and Id-Iq control strategies using both PI and fuzzy controllers

2011 ◽  
Author(s):  
S. Mikkili ◽  
A.K. Panda
Keyword(s):  
Control Strategies ◽  
Fuzzy Controllers ◽  
Current Harmonics

scholarly journals Simulation and RTDS Hardware Implementation of SHAF for Mitigation of Current Harmonics with p-q and Id-Iq Control Strategies Using PI Controller

2011 ◽  
Vol 1 (3) ◽  
pp. 54-62 ◽  
Author(s):  
S. Mikkili ◽  
A. K. Panda
Keyword(s):  
Hardware Implementation ◽  
Control Strategies ◽  
Pi Controller ◽  
Current Harmonics ◽  
Active Power Filters ◽  
Power Filters ◽  
Three Phase ◽  
Detailed Simulation ◽  
Supply Voltages ◽  
Real Time Digital Simulator

Control strategies for extracting the three-phase reference currents for shunt active power filters are compared, evaluating their performance under different source conditions in MATLAB/Simulink environment and also with Real Time Digital Simulator (RTDS) Hardware. When the supply voltages are balanced and sinusoidal, the two control strategies are converging to the same compensation characteristics but when the supply voltages are distorted and/or un-balanced sinusoidal, these control strategies result in different degrees of compensation in harmonics. The p-q control strategy is unable to yield an adequate solution when source voltages are not ideal.  Extensive Simulations are carried out with PI controller for both p-q and Id-Iq control strategies for different voltage conditions and adequate results were presented. The 3-ph 4-wire SHAF system is also implemented on RTDS Hardware to further verify its effectiveness. The detailed simulation and RTDS Hardware results are included.

scholarly journals Power Quality Assessment of Grid-Connected PV System in Compliance with the Recent Integration Requirements

Electronics ◽  
2020 ◽  
Vol 9 (2) ◽  
pp. 366 ◽  
Author(s):  
Ali Q. Al-Shetwi ◽  
M A Hannan ◽  
Ker Pin Jern ◽  
Ammar A. Alkahtani ◽  
A. E. PG Abas
Keyword(s):  
Power Quality ◽  
Power Plants ◽  
Large Scale ◽  
Low Voltage ◽  
Control Strategies ◽  
Frequency Variation ◽  
Pv System ◽  
Current Harmonics ◽  
Dynamic Voltage ◽  
Voltage Flicker

The generation and integration of photovoltaic power plants (PVPPs) into the utility grid have increased dramatically over the past two decades. In this sense, and to ensure a high quality of the PVPPs generated power as well as a contribution on the power system security and stability, some of the new power quality requirements imposed by different grid codes and standards in order to regulate the installation of PVPPs and ensure the grid stability. This study aims to investigate the recent integration requirements including voltage sag, voltage flicker, harmonics, voltage unbalance, and frequency variation. Additionally, compliance controls and methods to fulfill these requirements are developed. In line with this, a large-scale three-phase grid-connected PVPP is designed. A modified inverter controller without the use of any extra device is designed to mitigate the sage incidence and achieve the low-voltage ride-through requirement. It can efficiently operate at normal conditions and once sag or faults are detected, it can change the mode of operation and inject a reactive current based on the sag depth. A dynamic voltage regulator and its controller are also designed to control the voltage flicker, fluctuation, and unbalance at the point of common coupling between the PVPP and the grid. The voltage and current harmonics are reduced below the specified limits using proper design and a RLC filter. The obtained results show that the proposed controller fulfilled the recent standard requirements in mitigating power quality (PQ) events. Thus, this study can increase the effort towards the development of smooth PVPP integration by optimizing the design, operation and control strategies towards high PQ and green electricity.

scholarly journals Current Control Strategies for a Star Connected Cascaded H-Bridge Converter Operating as MV-AC to MV-DC Stage of a Solid State Transformer

Energies ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4607
Author(s):  
Sebastian Stynski ◽  
Marta Grzegorczyk ◽  
Cezary Sobol ◽  
Radek Kot
Keyword(s):  
Solid State ◽  
Control Algorithm ◽  
Power Flow ◽  
Low Voltage ◽  
Control Strategies ◽  
Current Control ◽  
Renewable Energy Resources ◽  
Solid State Transformer ◽  
Voltage Transformer ◽  
Current Harmonics

Nowadays, the increasing number of nonlinear loads and renewable energy resources pose new challenges for the standard electrical grid. Conventional solutions cannot handle most of them. The weakest component in the whole system is a conventional distribution (converting medium to low AC voltage) transformer. It should not operate with unbalanced, heavily distorted voltage and cannot control power flow or compensate current harmonics. One of the promising solutions to replace the conventional transformer and thus minimize power flow and grid distortions is a power electronics device called a solid state transformer (SST). Depending on the SST topology, it can have different functionalities, and, with the proper control algorithm, it is able to compensate any power imbalances in both low voltage (LV) and medium voltage (MV) grid sides. In the case of a three energy conversion stage SST, the LV and the MV stages can be treated separately. This paper focuses on the MV-AC to the MV-DC stage only based on a star-connected cascaded H-bridge converter. In this paper, a simple control solution for such a converter enabling different current control strategies to distribute power among the phases in an MV grid in the case of voltage imbalances is proposed. Simulation and experimental results proved good performance and verified the validity of the proposed control algorithm.

scholarly journals A Review on Shunt Active Power Filter Control Strategies

2018 ◽  
Vol 7 (4.5) ◽  
pp. 121 ◽  
Author(s):  
Harnek Singh ◽  
Maneet Kour ◽  
Dip Vinod Thanki ◽  
Prakash Kumar
Keyword(s):  
Reactive Power ◽  
Control Strategies ◽  
Active Power Filter ◽  
Voltage Regulation ◽  
Active Power ◽  
Current Control ◽  
Voltage Source ◽  
Shunt Active Power Filter ◽  
Current Harmonics ◽  
Power Filter

Shunt active power filter (SAPF) has now become a well-known sophisticated technology to overcome current harmonics and reactive power compensation issues. In this paper a technical review of various control strategies for operation of SAPF has been presented. Control strategies such as reference current generation by time domain, frequency domain and soft computing approaches; voltage control for dc link voltage regulation and current control for generating switching patterns for voltage source inverter has been discussed. This paper aims to provide a broad understanding on SAPFs for various research and engineering applications.  

scholarly journals PI and Fuzzy Control for P-removal in Wastewater Treatment Plant

2015 ◽  
Vol 10 (6) ◽  
pp. 176 ◽  
Author(s):  
Hongyang Xu ◽  
Ramon Vilanova
Keyword(s):  
Wastewater Treatment ◽  
Control Strategy ◽  
Wastewater Treatment Plant ◽  
Control Strategies ◽  
Treatment Plant ◽  
Wastewater Treatment Process ◽  
Fuzzy Controllers ◽  
Linear Character ◽  
N Removal ◽  
Pi Controllers

Due to the complex and non linear character, wastewater treatment process is difficult to be controlled. The demand for removing the pollutant, especially for nitrogen (N) and phosphorus (P), as well as reducing the cost of wastewater treatment plant is an important research theme recently. Thus, in this paper, the benchmark proposed default control strategy and 10 additional control strategies are applied on the combined biological P and N removal Benchmark Simulation Model No.1 (BSM1-P). In addition, according to the results of applying PI controllers, as usual, we also chose the group with the better performance, as well as the default control strategy, to replace the PI controllers with fuzzy controllers. In this way, it can be seen that in all cases the quality of effluent of the controlled process could be improved in some degree; and the fuzzy controllers get a better phosphorus removal.

scholarly journals Mitigation of Harmonics in Three - Phase Three - Wire System by using Fuzzy Logic Controlled Shunt Active Filters

2020 ◽  
Vol 6 (11) ◽  
pp. 87-91
Author(s):  
Goggi Kirshna Sanyasi Rao and P.Murari
Keyword(s):  
Reactive Power ◽  
Control Strategies ◽  
Pi Controller ◽  
Active Power ◽  
Active Filters ◽  
Shunt Active Power Filter ◽  
Current Harmonics ◽  
Active Power Filters ◽  
Power Filters ◽  
Synchronous Reference Frame

This paper shows the method of improving the power quality using shunt active power filter. In order to protect the supply system from current harmonics, we have to use the active power filters. These are used to compensate the reactive power compensation, but the performance of active power filters are based on various control strategies. This paper presents the complete examination to estimate the working of SHAF for generating the current references under steady and transient for balanced, unbalanced and non-sinusoidal conditions by using PI controller. The P-Q theory and synchronous reference frame theory, which are widely used in SHAF. The most validate results obtained by simulation with matlab/simulink software are carried out with PI controller for P-Q control theory for various voltage conditions like balanced, unbalanced and non-sinusoidal conditions and dynamic load changes.

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