This paper proposes a power control method to improve a stability of a small-scale power grid with renewable energy sources. In an isolated small- scale power grid such as an island, diesel power plant is main power s...This paper proposes a power control method to improve a stability of a small-scale power grid with renewable energy sources. In an isolated small- scale power grid such as an island, diesel power plant is main power source which has an environmental burden and expensive running cost due to high priced fossil fuel. Thus, expanding installation of the renewable energy sources such as a wind power is strongly desirable. Such fluctuating energy sources, however, harm power quality of the small-scale power grid, and in addition, conventional power plant in the small-scale power grid cannot, in general, stabilize the grid system with such fluctuating power sources. In this study, Variable Speed Doubly-Fed Induction Generator (VS-DFIG) is proposed to be in-stalled at a diesel power plant instead of a conventional Fixed Speed Synchronous Generator (FS-SG), because quick control of a power balance in the small-scale power grid can be achieved by using the inertial energy of VS-DFIG. In addition, utilization of a Battery Energy Storage System (BESS) is also considered to assist cooperatively the VS-DFIG control. As a result of the simulation analysis by using the proposed method, it is verified that frequency fluctuations due to renewable energy source can be effectively reduced by quick power control of the VS-DFIG compared to the conventional FS-SG, and further control ability can be obtained by utilizing BESS. Moreover, the transient stability of a small-scale power grid during a grid fault can also be enhanced.展开更多
分布式冷热电联供(combined cooling,heating and power,CCHP)系统是一种小型、临近用户的新型供能方式,可避免能量长距离传输过程损失,同时具有灵活、高效、环保特点,成为大规模、集中式供能方式的重要补充。中小型发电装置是分布式冷...分布式冷热电联供(combined cooling,heating and power,CCHP)系统是一种小型、临近用户的新型供能方式,可避免能量长距离传输过程损失,同时具有灵活、高效、环保特点,成为大规模、集中式供能方式的重要补充。中小型发电装置是分布式冷热电联供系统的核心,制冷和制热也都围绕发电装置余热展开。对适合分布式冷热电联供系统的2类中小型发电装置的基本工作原理、热力性能和相关研究进展进行综述。一类是以化石燃料为能源输入的中小型发电装置,包括微型燃气轮机、燃气内燃机、小型燃气轮机和燃料电池;另一类是以发电装置余热或太阳能集热等其他热源为能源输入的中小型发电装置,包括有机朗肯循环、正逆耦合循环、热声发电机等。最后,对2类中小型发电装置的优缺点进行对比分析,为分布式供能系统的发电装置选型、系统方案设计等提供参考。展开更多
文摘This paper proposes a power control method to improve a stability of a small-scale power grid with renewable energy sources. In an isolated small- scale power grid such as an island, diesel power plant is main power source which has an environmental burden and expensive running cost due to high priced fossil fuel. Thus, expanding installation of the renewable energy sources such as a wind power is strongly desirable. Such fluctuating energy sources, however, harm power quality of the small-scale power grid, and in addition, conventional power plant in the small-scale power grid cannot, in general, stabilize the grid system with such fluctuating power sources. In this study, Variable Speed Doubly-Fed Induction Generator (VS-DFIG) is proposed to be in-stalled at a diesel power plant instead of a conventional Fixed Speed Synchronous Generator (FS-SG), because quick control of a power balance in the small-scale power grid can be achieved by using the inertial energy of VS-DFIG. In addition, utilization of a Battery Energy Storage System (BESS) is also considered to assist cooperatively the VS-DFIG control. As a result of the simulation analysis by using the proposed method, it is verified that frequency fluctuations due to renewable energy source can be effectively reduced by quick power control of the VS-DFIG compared to the conventional FS-SG, and further control ability can be obtained by utilizing BESS. Moreover, the transient stability of a small-scale power grid during a grid fault can also be enhanced.
文摘分布式冷热电联供(combined cooling,heating and power,CCHP)系统是一种小型、临近用户的新型供能方式,可避免能量长距离传输过程损失,同时具有灵活、高效、环保特点,成为大规模、集中式供能方式的重要补充。中小型发电装置是分布式冷热电联供系统的核心,制冷和制热也都围绕发电装置余热展开。对适合分布式冷热电联供系统的2类中小型发电装置的基本工作原理、热力性能和相关研究进展进行综述。一类是以化石燃料为能源输入的中小型发电装置,包括微型燃气轮机、燃气内燃机、小型燃气轮机和燃料电池;另一类是以发电装置余热或太阳能集热等其他热源为能源输入的中小型发电装置,包括有机朗肯循环、正逆耦合循环、热声发电机等。最后,对2类中小型发电装置的优缺点进行对比分析,为分布式供能系统的发电装置选型、系统方案设计等提供参考。
