Due to the global warming and energy resource shortage, renewable energies such as wind generation (WG), photovoltaic (PV) facility are getting more attention in distribution systems. It is very necessary to use renewable energy with present power equipments cooperatively as it can be easily affected by the different weather conditions. Since the cost of diesel generator (DG) is high when starting up or shutting down, the electric power system should consist of small power system groups and share electric power with each other by interchanging. In this paper, the optimal method is proposed to determine the scheduling of the isolated island power system including WG, PV facility, DG, and battery energy storage system (BESS). The optimization is divided into two parts using genetic algorithm. First, the scheduling problem of DG unit commitment is decided by the revised load with the optimal operation of individual power system. Second, optimization of the electric power system group is performed by using the results of first step. The simulation results show the reduction of operational cost which confirms the feasibility and effectiveness.
This paper analyzes the relationship between corporate cash holdings and commercial credit from the perspective of supply chain, selects 1162 listed companies from 2017 to 2021 as sample objects, analyzes the impact of corporate commercial credit on cash holdings, and discusses the regulatory role of regional financial development level on this impact. The final result shows that there is a significant positive correlation between business payables, i.e. business credit obtained by enterprises, and cash holdings; There is a significant negative correlation between enterprise receivables, i.e. business credit provided by enterprises, and enterprise cash holdings.
In the manufacturing supply chain, there is a tripartite relationship between upstream suppliers, midstream manufacturing enterprises and downstream customers. The supply chain environment is changing from competition to cooperation. Based on the perspective of supply chain, the study of the impact of cash holdings and business credit of manufacturing enterprises in Zhejiang Province is conducive to a comprehensive review of the relationship between cash holdings and business credit of manufacturing enterprises in Zhejiang Province, and enhance their competitive position in the supply chain. It is found that the cash holding level of manufacturing enterprises in Zhejiang Province is negatively correlated with the occupation of the commercial credit of upstream suppliers, positively correlated with the occupation of the commercial credit of downstream customers, and positively correlated with the occupation of the overall commercial credit of the supply chain.
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