Grid Integration of Livestock Biogas Using Self-Excited Induction Generator and Spark-Ignition Engine
Author:
Trairat Panupon1ORCID, Somkun Sakda1ORCID, Kaewchum Tanakorn1, Suriwong Tawat1, Maneechot Pisit1, Panpho Teerapon1, Wansungnern Wikarn1, Banthuek Sathit1, Prasit Bongkot1, Kiatsiriroat Tanongkiat2
Affiliation:
1. School of Renewable Energy and Smart Grid Technology (SGtech), Naresuan University, Phitsanulok 65000, Thailand 2. Department of Mechanical Engineering, Chiang Mai University, Chiang Mai 50300, Thailand
Abstract
This study developed a grid-connected biogas power generation system for a rural community using a 3-phase 2.2 kW squirrel-cage induction machine as the self-excited induction generator. The generator was driven by a 196 cc single-cylinder spark-ignition engine fueled by biogas. We developed a back-to-back converter that consists of a 3-phase PWM rectifier as the generator-side converter and a single-phase LCL-filtered grid-connected inverter. The generator-side converter transferred the active power to the grid-side converter and supplied the reactive power control back to the generator. The notch filter-based bus voltage control on the generator side mitigated the inter-harmonics in the generator current. The injected grid current complied with the IEEE 1547 standard because of the multi-frequency unbalanced synchronous reference frame control. The proposed system was validated with biogas produced from pig manure at a pig farm in central Thailand, which found a maximum output of 1.2 kW with a thermal system efficiency of 10.7%. The proposed system was scheduled to operate at 1.2 kW for 8 h per day with a levelized cost of 0.07 US$/kWh, 42% cheaper than the retail electricity price, and a payback period of 2.76 years. The proposed system is suitable for a farm with a minimum of 34 pigs.
Funder
National Research Council of Thailand Research and Researchers for Industries (RRI) program and Big Solar Co., Ltd.
Subject
Energy (miscellaneous),Energy Engineering and Power Technology,Renewable Energy, Sustainability and the Environment,Electrical and Electronic Engineering,Control and Optimization,Engineering (miscellaneous),Building and Construction
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