Abstract
A large amount of wind power has to be curtailed due to the inflexibility of the combined heat and power (CHP) system in the heating season in northern China. The power-to-gas (P2G) technology, which uses electricity to produce hydrogen or synthetic natural gas, has become a promising energy conversion option for the utilization of surplus power energy. In this paper, an integrated natural gas, heat, and power dispatch (INGHPD) model which balances natural gas, heat, and power demand considering wind power and a P2G unit, is proposed. A natural gas network and P2G are modeled and integrated into the dispatch model. To demonstrate the effectiveness of the proposed model, an integrated energy system consisting of a six-bus power system, a six-node natural gas system, and a district heating system is simulated. The benefits of P2G are investigated in terms of reducing wind power curtailment, as well as system operation cost and CO2 emissions. The results in the deterministic model show that with the introduction of 40 MW P2G, the wind power curtailment rate decreases from 24.0% to 9.7%. The daily wind power energy consumed by P2G reaches 256 MWh and the daily CO2 emissions reduction reaches 46,080 kg. Additionally, the impact of the power and heat demand on the gas production of P2G and of the P2G capacity on the wind power curtailment are also investigated. P2G tends to generate more natural gas when the power demand is low and the heat demand is high.
Highlights
Wind energy has achieved a great development all over the world in recent years
The power outputs of NGFU2 have not changed, but the wind power curtailment rate increases from 23.1% to 24.0%
The daily wind power energy consumed by P2G reaches 256 MWh
Summary
Wind energy has achieved a great development all over the world in recent years. In China, the gross installed capacity of wind power reached 97 GW by the end of 2014, representing 27% of the global installed capacity. In the winter, when the heat demand is high and the power demand is low, CHP units have to meet the heat demand and generate a considerable amount of electricity, leaving little room for wind power integration. P2G provides the bidirectional energy flow between a power and natural gas system, which can largely increase the efficiency of energy utilization It provides an important flexibility option for the CHP system in northern China and needs to be further studied. An integrated natural gas, heat, and power dispatch (INGHPD) model which balances the natural gas load, heat load, and power load is proposed, with a consideration of the constraints of the three systems. (3) P2G is integrated into the dispatch model and its benefits in reducing the wind power curtailment, system operation cost, and CO2 emissions are evaluated.
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