# Power Quality Improvement of Distribution Network for Non-Linear Loads using Inductive Active Filtering Method Suresh Reddy D 1 Chidananda G Yajaman 2

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2 solved only to public grid but not to power supply system, for non-linear load, the APF circuit is altered and configured with the proposed IAF method. B. Inductive Active Filtering: The network topology for IAF method shown in fig 2b can be altered and configured by replacing converter and coupling transformer with an Inductively Filtered Converter Transformer. This transformer is connected between nonlinear load and power transformer. This converter transformer has special wiring scheme with the advantage that its secondary winding consists extended delta wiring. Between the extended and delta winding there is a linking point which is connected to the FT branch. This is shown in Fig.2c. The three phase VSI can be applied for medium and high power applications. The main purpose is to provide three phase source voltage, where the amplitude, phase and frequency of the voltages should always be controllable. The DC capacitor is connected at the output of VSI for smoothening and power factor correction. Hence to balance the secondary of winding of transformer, firstly Equivalent circuit is built and then the mathematical model. A. Equivalent Circuit: The three-phase equivalent circuit model for inductively filtered converter transformer and FT branch is constructed. In this model, each winding of transformer is equivalent to an impedance and FT branch as a controlled impedance. The analysis of fundamental and harmonic currents from load to grid can be seen in Fig.3a III. MODELING AND ANALYSIS OF FILTERING MECHANISM In the IAF circuit, the FT branch detects the harmonic current generated by the non-linear load and predicts the harmonic flow into the branch and it eliminates the harmonics through the LC filter which absorb harmonics and stop the flow in Distribution network. Fig. 2c: Block Diagram of IAF Fig. 2a: APF at primary of converter transformer Fig. 3a: Three-Phase Equivalent Circuit The voltage equations at the fundamental and harmonic frequencies can be obtained as Fig. 2b: Proposed IAF circuit (3.1) The Z h21 and Z h23 values is obtained from the short circuit test and Z 2h is calculated as All rights reserved by

5 FFT analysis for APF: THD = 7.58% HVDC converter transformer using field-circuit coupling, IEEE Trans. Ind. Electron., vol. 59, no. 11, pp , Nov [3] G. Bhuvaneswari and B. C. Mahanta, Analysis of converter transformer failure in hvdc systems and possible solutions, IEEE Trans.Power Del., vol. 24, no. 2, pp , Apr [4] Arkadiusz Kulka, Digital Control of Power Electronics for Reliable Distributed Power Generation, PhD Projects 2006 at Dep. of Electrical Power. Eng. University of Science and Technology. Norwegian, Jan [5] Madhukar Waware, Pramod Agarwal, Comparison of Control Strategies for Multilevel Inverter based Active Power Filter used in High Voltage Systems, IEEE/PEDES Power Electronics, Drives and Energy Systems, Dec [6] Bhim Singh, Kamal Al-Haddad, and Ambrish Chandra: A New Control Approach to Threephase Active Filter for Harmonics and Reactive Power Compensation, IEEE Transactions on Power Systems, Vol. 13, No. 1, pp , Feb FFT analysis for IAF: THD=4.27% y -axis: Mag (% of Fundamental) x-axis: Harmonic order Fig. 5d: FFT results on the current waveform in grid winding using APF and proposed IAF method. VI. CONCLUSION AND FUTURE WORK In this paper, using IAF method it is possible to improve the power quality of distribution network (public grid) and also the power-supply system (power consumer side) connected with the non-linear loads. The new power filtering method is introduced with the FT branch design, used to create the balance of harmonic magnetic potential in the windings of converter transformer. With the improved THD, it is possible to make the current in grid winding purely sinusoidal using IAF method. It has potential application in industrial powersupply systems and in future we can replace distributed network with the Renewable Energy Sources (RES) such as solar, wind etc. which will make the system more effective and reliable. REFERENCES [1] Wenjin Dai, Yongtao Dai and Tingjian Zhong, A New Method for Harmonic and Reactive Power Compensation, IEEE ICIT International Conference on Industrial Technology, Apr [2] Y. Li, L. Luo, C. Rehtanz, C. Wang, and S. Rüberg, Simulation of the electromagnetic response characteristic of an inductively filtered All rights reserved by

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