TCM considering EIZs' integration

Transmission congestion threatens the reliability and economy of power systems. It becomes more severe with the increase of load demands and peak−valley differences. In recent years, energy internet zones (EIZs) have attracted wide attention, and many demonstration projects have been developed. EIZs connect the supply and consumption of multi-energy like electricity, gas, heat, and cooling. Thus, EIZs’ electricity load demands can be flexibly adjusted by controlling their multi-energy flows. The controlling method should consider not only demand response but also heat, cooling, and gas energy balance. The integration of EIZs provides a new solution for transmission congestion management (TCM). First, an EIZ's optimal controlling strategy considering its multi-energy flow requirements was proposed. Then, the optimal re-dispatch problem for TCM was studied, taking into account EIZs' and traditional generators' adjustment costs. Re-dispatch determines the output adjustment schedules and compensation prices, while the EIZ's controlling strategy controls multi-energies' supply and consumption. A simplified Songjiang transmission system in Shanghai was adopted to illustrate the proposed methods. It was proven that the EIZs' integration could reduce the re-dispatch costs in TCM and increase EIZs' profits.