For a given load demand, security economic dispatch (SED) allocates the units generation to minimize the total production costs, including the security and load flow equation constraints.

安全经济调度(SED)注重在满足输电元件安全条件下，对一定负荷需求，力求以费用最小化来安排发电方式。

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However, the growing gas demand, total amount of city gas supply shortage and load capacity of the contradiction, which poses a severe test to the urban natural gas strategic security.

但是，不断增长的用气需求与城市气源总量和调峰能力不足的矛盾，还是给城市天然气战略安全提出了严峻的考验。

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However, the contradiction between the growing gas demand and the shortage in the total amount of city gas supply and load capacity, poses a severe test to the urban natural gas strategic security.

但是，不断增长的用气需求与城市气源总量和调峰能力不足的矛盾，还是给城市天然气战略安全提出了严峻的考验。

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