• Revealed electric heating load peaks stem from uneven sequence point distribution. • Proposed a same-temperature switching strategy for peak suppression. • Strategy ensures comfort and reduces device switching frequency. • Eliminated safety threats of periodic peaks to transformers. The rapid development of clean heating through coal-to-electricity conversion is strongly supported by a high share of surplus green electricity. However, in urban residential communities with similar household characteristics, clustered electric heating systems are prone to synchronized load peaks, a phenomenon referred to as temperature peak resonance. This resonance poses a serious threat to distribution transformers and the upstream power grid. Existing quantity-based control strategies struggle to address this issue effectively, suffering from wide user intervention scope, frequent switching actions, and notable vulnerability to rebound peaks. In response, this study reveals that temperature peak resonance is fundamentally driven by the uneven distribution of temperature-variation sequence points. Consequently, a novel sequence-based control method is proposed, which utilizes the average heating power demand as a reference to guide device-level same-temperature sequence switching between positive and negative half-cycles. Case studies demonstrate that the proposed strategy reduces the load peak-to-valley difference by approximately 92%. Ultimately, this approach eliminates safety threats to distribution transformers while ensuring user comfort and reducing device switching frequency.© 2017 Elsevier Inc. All rights reserved.
YAN et al. (Mon,) studied this question.