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With the development of modern power system, extra-high voltage (EHV) AC transmission lines are widely used. Because of large capacitive charging, long EHV AC lines may cause voltage violations in low load period. The leading-phase operation of synchronous generators and switching on shunt reactors are two common measures to relieve voltage violations in low load period. In this paper, we propose...
With the development of smart grid and the increasing penetration of intermittent generation such as wind and solar, transmission network must be operated more effectively and flexible. Transmission switching has been explored in some literature as an effective mean to reduce dispatch cost. In this paper, based on dc optimal power flow we formulate this problem as a bilevel programming problem. The...
This work aims at improving the energy harvester performance by using low-dimensional thermoelectric materials. A micro-thermoelectric generator with quantum well thermocouples is developed by state-of-the-art CMOS (Complementary metal-oxide semiconductor) process. A relaxation-time model is applied to analyze the characteristic length of silicon germanium quantum well, and a thermal model is also...
Power grid is the bridge between power plants and loads. It has direct influence to the security, reliability and economic efficiency of power system operation. With the power grid continuous expanding, it becomes more and more difficult to understand and analyze this influence clearly. According to mentioned above, this paper proposes a new index named power grid transmission performance index (PI)...
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