Simulation Single Phase Active Filter Based on p-q technique using MATLAB/Simulink Development Tools Environment

This paper presents a single phase shunt active power filter based on instantaneous power theory. The active filter will be connected directly to utility in order to reduce THD of load current, in this case the utility is TNB.The instantaneous power theory also known as p-q theory is used for three phase active filter and this paper proves that the p-q theory can also be implemented for single phase active filter. Since the system has only single phase signal for both voltage and current, thus the dummy signal with 120º different angels must be generated for input of the p-q theory. The p-q technique will generate six signals PWM for switching IGBT, but only two of the signals will be used to control the switching IGBT. The simulation results are on MATLAB/Simulink environment tools presented in order to demonstrate the performance of the current load on single phase shunt active power filter

Development of Load Control Algorithm for PV Microgrid

The variability of solar irradiance which is caused by the weather conditions could result in the mismatch between the solar PV generation and the demand particularly in the microgrid context. This may lead to the detrimental effects of over/under voltage or over/under frequency. In this regard, this paper presents the laboratory set-up of a grid-connected PV inverter operates in islanding condition. To achieve this, a load control algorithm is proposed to provide the autonomous real time demand control that follows the PV generation to maintain generation-demand equilibrium requirement. The laboratory results show that the proposed load control algorithm can successfully address the voltage and the frequency violation in islanding condition, regardless of the variation of irradiance and power generated by the PV sources

A New Improvement of Reverse Voltage Single Phase Multilevel Inverter Topology

The widely use of a multilevel inverter (MLI) in high power system applications proves that MLI is highly superior to the conventional inverter in reducing harmonic distortion. Basically there are three topologies of multilevel inverters that commonly used, which is cascaded H-Bridge, diode clamped and flying capacitor. Even though these inverters can produce low harmonic distortion, many switching devices are needed to perform high voltage level. However, the usage of a numerous number of switching devices can produce high switching losses. It also increases weight, space, cost and switching complexity of the hardware. Therefore, this study attempts to develop low harmonic distortion with less switching devices by improving the reverse voltage topology using MATLAB/Simulink software. The performance of proposed scheme was evaluated through an extensive test considering several scenarios such as amplitude modulation ratio (Ma), total harmonic distortion (THD) and switching scheme under various operating points. Moreover the effectiveness of the proposed scheme was verified by comparing its result with conventional MLI such as reverse voltage MLI topology and cascaded H-bridge topology

Simulation a Shunt Active Power Filter using MATLAB/Simulink

Along with increasing demand on improving power quality, the most popular technique that has been used is Active Power Filter (APF); this is because APF can easily eliminate unwanted harmonics, improve power factor and overcome voltage sags. This paper will discuss and analyze the simulation result for a three-phase shunt active power filter using MATLAB/Simulink program. This simulation will implement a non-linear load and compensate line current harmonics under balance and unbalance load. As a result of the simulation, it is found that an active power filter is the better way to reduce the total harmonic distortion (THD) which is required by quality standards IEEE-519

Performance of three-phase three-wire cascaded H-bridge multilevel inverter-based shunt active power filter

Multilevel inverter (MLI) becomes more significant in Active Power Filter (APF) application due to capability to its produce low harmonic output current in which at the same time improving performance of APF. Among the topologies of MLI, Cascaded H-Bridge (CHB) is the most popular topology with less power devices requirement and simple design. MLI CHB is also capable to produce possible output voltage at twice of the number of DC source which in this case of APF is the best suited topology to replace with the conventional six -step inverter. This paper presents the performance of three- phase three-wire CHB MLI used in Shunt Active Power Filter (SAPF) based on Direct Current Control (DCC) and Indirect Current Control (ICC) schemes. Both schemes are developed and verified in MATLAB/Simulink. The simulation results show that both current control algorithms are capable to mitigate load current with Total Harmonic Distortion below than the permissible value based on IEEE 519 standard

Analysis Of A Bearingless Permanent Magnet Synchronous Motor

Bearingless permanent magnet synchronous motor (BPMSM) is known as both conventional permanent magnet synchronous motor and traditional magnetic bearings. For the purpose of this paper, the design and analysis of BPMSM using a Matlab/Simulink and 2-D ANSYS Maxwell are presented. The principle of electromagnetic force is utilized to ensure a stable levitation operation of BPMSM. The BPMSM mathematical model that is established to represent the dynamic of motoring force and radial suspension force is simulated in Matlab/Simulink environment. The ANSYS Maxwell, as an accurate finite element method (FEM) software in solving static, frequency-domain, and time-varying electromagnetic and electric fields is used to assist the development of the BPMSM model before the integration with the control system is performed. The excitation of motoring winding and suspension winding are independently controlled through separate PI controller. The applications for BPMSM are suitable for high speed electrical machines such as compressors, turbines, pumps, and mixers

Adaptive notch filter under indirect and direct current controls for active power filter

This study presents the implementation of adaptive notch filter (ANF) as reference signal extraction for shunt active power filter (APF) in indirect current control (ICC) and direct current control (DCC) modes for three phase system. The ANF functions to filter the signal that inputted to it by producing a fundamental signal and harmonics signal. The advantage of applying the ANF algorithm is based on its simple design that giving the ANF advantages to be utilize in microcontroller. The performance of the ANF is validated though MATLAB simulation in ICC dan DCC configurations. Based on the simulation results, the ANF is capable to work efficiently for both ICC and DCC modes, but in term of efficiency, the ICC mode is clearly showing a better harmonics mitigation result. Base on the result also it shown that the ANF is capable of mitigate the harmonics below the standard required by the IEEE 519-92. The application of ANF is useful to be applied due to its simple design and filtering method