The synergistic integration of renewable energy generation with an integrated energy system (IES) can potentially reduce carbon emission and thus improve energy efficiency. On the basis of this principle, an electric-hydrogen-coupled integrated energy system (EHC-IES) is proposed, integrating renewable energy generation, an electric-hydrogen conversion device, multi-energy storage, and an intelligent sensing system. A multi-dimensional sensing network is erected to collect real-time wind and solar power generation, energy storage status, and load fluctuation data. It can dynamically adjust the energy supply strategy and realize the adaptive synergistic matching of energy supply and demand sides. An optimization model is established considering the cost of superior-level energy dispatch and the cost of renewable energy disposal penalty, and the enhanced whale optimization algorithm is designed for dispatch optimization. Comparative analysis using multiple scenarios verifies that the electric-hydrogen coupling mechanism can reduce the system operating cost by 25.8 and 17.02% compared with those of the conventional integrated energy system and power-to-gas IES (P2G-IES), respectively, confirming significant economic benefit.