P.K. Linash

Bio: P.K. Linash is an academic researcher from Indian Institute of Technology Madras. The author has contributed to research in topics: Switched-mode power supply & Voltage. The author has an hindex of 1, co-authored 1 publications receiving 7 citations.

A Fast Transient Response Single Phase Active Power Filter

Abstract: In this paper a fast dynamic response single phase active power filter is proposed. The method proposed, compensates the non-linear load by improving the power factor to the desired value and also eliminates the harmonics. The scheme is shown to work for both types compensation i.e. power factor correction plus harmonic elimination and harmonic elimination only under sinusoidal and non-sinusoidal supply voltage conditions. The active power filter (compensator) is realized using a single-phase voltage source inverter operated in a hysteresis current control mode. The method is validated through digital simulation results using MATLAB. The results have been shown with ideal and practical compensator with an emphasis on dynamic performance.

Comparison of single phase shunt active power filter algorithms

Abstract: A comparative study of different algorithms for extracting reference compensating current for single-phase shunt active power filter is presented. The paper discusses different type of approaches, both direct and indirect methods, in detail. The performance of these algorithms is investigated giving an emphasis to the transient performance of the active power filter.

A Simple Control Scheme for Single-Phase Shunt Active Power Filter with Fuzzy Logic Based DC Bus Voltage Controller

Abstract: In this paper, a simple control scheme of single-phase shunt active power filter for current harmonics and reactive power compensation of linear and non-linear loads, is proposed. Simplicity of the proposed control scheme is based on uncomplicated reference source current generation and fuzzy logic based dc bus voltage regulation methods. Thus, complex computations are not needed. To indicate reactive power and current harmonics compensation capability in both transient and steady state, leading and lagging power factor linear loads and uncontrolled rectifier and thyristor based ac regulator non-linear loads are connected to the system. The effectiveness of the proposed control technique is verified by the simulation results.

A Lyapunov-Function Based Controller for 3-Phase Shunt Active Power Filter and Performance Assessment Considering Different System Scenarios

Abstract: Shunt active power filter (SAPF) belongs to the class of custom power devices (CPDs) and offers compensation to harmonics originated owing to customer side nonlinear loads, reactive power and unbalance in the distribution power networks functioning in current control mode (CCM). The performance of a SAPF as a harmonic compensator entirely relies on the control technique i.e. the precise detection of the harmonic current components of load that are necessary to be compensated. In the present work, a 3-phase SAPF, inspired by a Lyapunov function based control approach, has been designed for compensation of harmonics resulted in the feeder current owing to the customer side nonlinearity. A control law is determined in the proposed strategy which makes the derivative of the Lyapunov function consistently a negative one for an entire set of stable states. The DC-link capacitor voltage is regulated at constant reference through the proportional-integral (PI) controller. In this method rating of the shunt active power filter is considerably reduced than the other two broadly employed conventional methods. Furthermore, the harmonic compensation efficacy of the proposed Lyapunov function based SAPF is compared with the one based on other two conventional approaches under four different system scenarios namely a simple nonlinear load with and without utility side voltage distortion, a modified IEEE 13 bus test distribution system loaded with a 3-phase chopper fed direct current (DC) motor drive at a single bus and last especially for increasing the harmonic-constrained penetration level of renewable energy. Results obtained through simulation performed in MATLAB/Simulink shows that total harmonic distortion (THD) of source current and dynamic, as well as steady-state performance with Lyapunov function based controller, is significantly improved than the other two conventional methods. Also, the robust compensation performance of the SAPF empowers it to deal with the high penetration of renewable energy.

A comparative study of control techniques of distribution-STATCOM under abnormal source voltage

Abstract: The most important concern regarding a power system is the quality of its power. The main cause of most of the issues is nonlinear loads only. D-STATCOM has turned out to be a good solution to solve this problem because of its ability to compensate reactive power and harmonic components demand of the nonlinear loads. This paper presents comprehensive analysis of comparison the performance of five control techniques for reference currents extraction of D-STATCOM under balanced, un-balanced and distorted voltage condition. The algorithms to be compared are symmetrical components based algorithm, IRP theory, generalized IRP theory, SRF method, and synchronous detection method respectively those are widely used in D-STATCOM. These all algorithms have been simulated in Matlab/Simulink environment. The theoretical study and simulation testing shows the performance and accuracy of considered algorithms in case of balanced unbalanced and distorted source voltage conditions.

Shunt active power filtering for smart appliances

Abstract: Due to the increasing trend towards energy saving white goods appliances and the commercial viability of power electronic components, there has been an expansion in the use of solid state electronics and variable frequency drive motors in these applications. However, a major drawback of using such energy efficient loads is the introduction of current harmonics onto the local distribution grid. Furthermore, the proliferation of such devices elevates the supply harmonic content and can potentially impact residential distribution networks. This paper investigates the harmonic content generated by some household appliances and suggests a solution to minimize harmonics by means of active filtering. An active filter circuit was simulated to compare filter performance when used as an active front versus a feeder input compensator.