Abstract
Wind power has achieved great development in Northern China, but abundant wind power is dissipated, rather than utilized, due to inflexible electricity production of combined heat and power (CHP) units. In this paper, an integrated CHP system consisting of CHP units, wind power plants, and condensing power plants is investigated to decouple the power and heat production on both the power supply side and heat supply side, by incorporating electrical energy storage (EES) and thermal energy storage (TES). Then the integrated CHP system dispatch (ICHPSD) model is formulated to reach the target of reducing wind power curtailment and primary energy consumption. Finally, the feasibility and effectiveness of the proposed ICHPSD model are verified by the six-bus system, and the simulation results show that EES has a better effect on wind power integration than TES. The annual net benefits by incorporating EES and TES increase with increasing wind penetration, but they gradually approach saturation. Introducing both EES and TES can largely increase the amount of wind power integration and improve the operation efficiency of the system.
Highlights
The targets of reducing fossil fuel consumption and greenhouse gas emission are driving China to vigorously develop renewable energy [1]
An integrated combined heat and power (CHP) system consisting of CHP units, wind power plants, condensing power plants, energy storage (EES), and thermal energy storage (TES) is considered
Heat demand is satisfied by CHP units and TES units, while power demand is satisfied by CHP units, condensing power units, wind power units and EES
Summary
The targets of reducing fossil fuel consumption and greenhouse gas emission are driving China to vigorously develop renewable energy [1]. The surplus thermal energy is stored during the operating periods for a later use when electrical demand is low, leading to a decrease in heat production of CHP plants, along with a reduction in electricity production, as a result, wind power would be better integrated. In [21], a CHP-based district heating system with TES is proposed to promote the utilization of renewable energy over a long period of time All of these studies optimized the system on the heat supply side. The integrated CHP system in which CHP units are coupled with EES and TES is investigated to explore its capability to enhance the utilization of wind power.
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