Under the context of the new power system

the transition from ‘province-level balancing’ to ‘interconnected region mutual support’ was recognized as a critical measure for ensuring the safe and stable operation of power systems. By comprehensively considering multi-level power balancing issues

the study explored the collaborative relationships and logic among national

regional

and provincial levels. A differentiated net load demand characterization was designed to capture the complex interactions and cross-level impacts. At the same time

a refined three-level collaborative balancing model (national-regional-provincial) was constructed based on the operational realities of inter-regional and inter-provincial transmission lines. To reduce complexity

an equivalent aggregation concept was introduced

and the Alternating Direction Method of Multipliers (ADMM) was employed to establish consistency constraints

allowing for simultaneous variable transmission across national

regional

and provincial levels while achieving hierarchical decoupling solutions. This approach effectively solved the multi-level collaborative scheduling optimization problem by striking a balance between solution accuracy and computational efficiency. Furthermore

addressing the severe impact of extreme weather on the new power system

case studies were conducted under both typical and extreme scenarios across multiple interconnected grid. The results demonstrated that the national-regional-provincial multi-level collaborative balancing model

showing a 2.32% reduction in system operating costs

2.42% decrease in loss of load probability

and approximately 2% improvement in renewable energy accommodation rates. The results confirmed that this approach effectively enhanced regional mutual support capabilities

achieving reduced operational costs

improved power supply reliability

and increased renewable energy integration at the provincial

regional

and national levels.