Integrated Electrical and Automatic Control Design for Electrode Boiler Thermal Storage Heating in Severe Cold Regions Based on Source-Grid-Load Coordination

STo address the challenges of large-scale photovoltaic (PV) curtailment during winter heating periods in corps farms of northern Xinjiang, along with the power limitations of conventional electric heating systems and the disconnection between electrical and thermal control designs, this paper proposes an integrated electrical and automatic control design scheme featuring 10kV direct-supply electrode boilers coordinated with DCS, based on the 500,000 m2 coal-to-electricity heating retrofit project in the 125th Corps, Seventh Division. Utilizing on-site meteorological, geotechnical, and power grid survey data, a multi-dimensional electrical comparison identifies the optimal technical route of 2×25MW immersed electrode boilers combined with atmospheric stratified water thermal storage. The innovative design incorporates a direct-supply power distribution architecture eliminating step-down transformers, an active power filter (APF) harmonic mitigation solution, and a three-stage automatic thermal storage control logic triggered by PV output, time-of-use electricity pricing, and ambient temperature, while establishing a multi-level electrical-thermal safety interlock system suited for extreme cold conditions down to -22.2℃. Engineering measurements demonstrate that the system achieves a total harmonic distortion (THD) of 2.7%, consumes 29.7885 million kWh of PV electricity during the heating season, reduces the regional PV curtailment rate from 18.2% to 3.6%, and cuts annual CO² emissions by 58,600 tons, realizing zero coal-fired pollutant emissions. This integrated design methodology can serve as a standardized technical paradigm for similar coal-to-electricity thermal storage heating projects in severe cold regions.