Abstract
Large fluctuations may occur on the energy supply and the load sides when large-scale renewable energies are integrated, leading to great challenges in power systems. The renewable power curtailment is especially numerous in the integrated electricity-heat energy system (IEHES) on account of electricity-heat coupling. The flexible resources (FRs) on both the energy supply and load sides are introduced into the optimal dispatch of the IEHES and further modeled to alleviate the renewable fluctuations in this paper. On the energy supply side, three kinds of FRs based on electricity-heat coordination are modeled and discussed. On the load side, the shiftable electricity demand resource is characterized. On this basis, the solution for FRs participating in IEHES dispatch is given, with goals of maximizing the renewable penetration ratio and lowering operation costs. Two scenarios are performed, and the results indicate that the proposed optimal dispatch strategy can effectively reduce the renewable energy curtailment and improve the flexibility of the IEHES. The contribution degrees of different FRs for renewable integration are also explored.
Highlights
Large fluctuations may occur on the energy supply and the load sides when large-scale renewable energies are inte‐ grated, leading to great challenges in power systems
If the flexible resources (FRs) are not enough for system dispatch, the renewable energy with weak control‐ lability is discarded [6]. This situation is especially aggravat‐ ed in an integrated electricity-heat energy system (IEHES) because many combined heat and power (CHP) units are op‐ erated in the heat-led mode, and the electricity outputs are heavily restricted by heat production [7], [8]
FRs on the power supply and load sides of an IEHES are introduced to IEHES dispatch for renewable penetration
Summary
1) Electricity Released by HSD An HSD stores heat from CHP units when the electricity demand is greater than the electricity productions under the WANG et al.: OPTIMAL OPERATION OF AN INTEGRATED ELECTRICITY-HEAT ENERGY SYSTEM CONSIDERING FLEXIBLE RESOURCES. The heat storage in the HSD compensates for the lack of heating from the CHP units when their electricity productions are limited. Where and are the heat storage and release power of HSD i at time t, respectively;. The thermal inertia of the PHN and equivalent buildings reflects the passive heat storage capacity of the DHS, which can adjust the heat load of the CHP unit, thereby indirectly alleviating the serious thermoelectric coupling and improv‐ ing the scheduling flexibility of the IEHES. The electricity consumption is linearly related to the heat putout:
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